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A Million Whys Book 4: The Wild Expedition

All 150 questions from Book 4, each with a short video answer. Tap any video to watch.

Videos150 videos
Why Are Leaves Green?

Why Are Leaves Green?

Question 1

Leaves look green because they are packed with chlorophyll, a green tool. Chlorophyll catches sunlight, and that helps the plant make its own food. So the green color is a clue that the leaf is hard at work!

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Why Do Trees Have Bark?

Why Do Trees Have Bark?

Question 2

Bark is a tree's coat and shield. It keeps out bugs, weather, and bumps that could hurt the soft parts inside. Think of it like a raincoat and a helmet, all wrapped around the trunk.

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Why Do Flowers Smell Sweet?

Why Do Flowers Smell Sweet?

Question 3

A sweet smell is like a billboard for a flower. It tells bees, butterflies, and other helpers that nectar and pollen are here. So flowers smell sweet to get visitors!

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Why Do Some Trees Lose Their Leaves?

Why Do Some Trees Lose Their Leaves?

Question 4

Many trees drop their leaves before winter. That way they do not spend energy on parts that would freeze or dry out when the sun is weak. Let's watch how a leaf lets go!

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Why Do Roots Grow Down?

Why Do Roots Grow Down?

Question 5

Roots grow down because they follow gravity. Down is where soil holds moisture, and where a plant can anchor itself. So wind does not tip it over!

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Why Do Plants Need Sunlight?

Why Do Plants Need Sunlight?

Question 6

Sunlight is a plant's power source. Without it, chlorophyll cannot make sugar, and the plant slowly runs out of food. So plants lean toward the light!

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Why Do Seeds Travel?

Why Do Seeds Travel?

Question 7

A seed that falls only at its parent's feet must compete with the big plant for light and water. Traveling gives the baby plant a new patch of soil. So seeds have clever ways to go places!

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Why Is a Forest Quiet, Then Loud?

Why Is a Forest Quiet, Then Loud?

Question 8

A forest is full of living sound-makers that clock in at different hours. Midday can feel hushed, while dawn and dusk can roar with birds, frogs, and insects. So the forest is quiet, and then loud.

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Why Do Mushrooms Pop Up After Rain?

Why Do Mushrooms Pop Up After Rain?

Question 9

The mushroom you see is only the fruit of a fungus. The real fungus is a hidden web in the soil. Rain tells that web that it is time to send up a cap and spread spores!

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Why Do Vines Climb?

Why Do Vines Climb?

Question 10

A vine is a plant that borrows height. Climbing is cheaper than growing a thick trunk, and height means more sunlight. So vines climb to reach the light!

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Why Is Moss So Soft and Low?

Why Is Moss So Soft and Low?

Question 11

Moss is a tiny plant with no true tall stem and no thick roots. It hugs rock and soil like a soft green cushion. Staying low keeps it in the damp layer near the ground.

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Why Do Pine Trees Stay Green All Year?

Why Do Pine Trees Stay Green All Year?

Question 12

Pine needles are leaves built for winter. They are thin, tough, and waxy, so they can keep making a little food even when other trees are bare. That is why pines stay green!

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Why Do Some Plants Have Thorns?

Why Do Some Plants Have Thorns?

Question 13

Thorns, spines, and prickles are plant armor. They turn a juicy stem or leaf into a painful snack, so many animals try a different plant. Armor is a smart idea when you cannot run away.

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Why Do Leaves Turn Red and Gold?

Why Do Leaves Turn Red and Gold?

Question 14

In autumn, green chlorophyll fades first. Yellow and orange were hiding underneath the whole time. Some trees also make extra red!

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Why Do Trees Have Rings Inside?

Why Do Trees Have Rings Inside?

Question 15

A ring is one year of new wood. In many climates, a tree grows in a yearly pulse, so you can count the pulses. The trunk keeps a weather diary inside!

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Why Do Plants Drink Through Roots?

Why Do Plants Drink Through Roots?

Question 16

Roots are the plant's drinking straws. Tiny hairs pull water and minerals from the soil, so the leaves can cook food in the sun. Let's follow one drink!

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Why Do Some Flowers Close at Night?

Why Do Some Flowers Close at Night?

Question 17

Closing is a nightly shield. Petals fold to protect pollen from dew and cold, and from night visitors the flower does not need. It is not sleeping, it is a timed job!

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Why Do Weeds Grow in Sidewalk Cracks?

Why Do Weeds Grow in Sidewalk Cracks?

Question 18

A crack is a tiny garden. Wind drops a seed, dust and rain collect, and the seedling only needs a sliver of soil and a strip of sun. Many weeds make thousands of tough seeds!

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Why Do Forests Feel Cooler?

Why Do Forests Feel Cooler?

Question 19

A forest is living shade, plus living air conditioning. Leaves block the sun, and they release water vapor that carries heat away. So the air under the trees feels cooler.

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Why Do Acorns Become Oaks?

Why Do Acorns Become Oaks?

Question 20

An acorn is an oak baby, packed with lunch. If it lands in damp soil and does not get eaten, that lunch fuels a root, then a shoot, then a tree. That is how a mighty oak begins!

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Why Do Some Plants Eat Bugs?

Why Do Some Plants Eat Bugs?

Question 21

A few plants live in soggy soil that lacks minerals. Catching a bug is how they grab extra nutrients, especially nitrogen. The plant still makes its sugar from sunlight.

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Why Do Cactuses Store Water?

Why Do Cactuses Store Water?

Question 22

A desert can go weeks without rain. A cactus is a living water tank, with a waxy skin that slows leaks and thick stems that hold moisture. Deserts are very dry, so every drop counts.

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Why Do Leaves Have Veins?

Why Do Leaves Have Veins?

Question 23

Veins are roads and drinking straws inside a leaf. They carry water in and sugar out, and they keep the soft leaf blade from flopping. Let's follow the delivery!

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Why Do Trees Sway But Not Snap?

Why Do Trees Sway But Not Snap?

Question 24

A living trunk is strong and springy. Bending lets wind energy pass through, instead of breaking the wood the way a stiff pole might. Let's watch a tree ride the wind!

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Why Do Forests Need Dead Logs?

Why Do Forests Need Dead Logs?

Question 25

A fallen log is not trash. It is a slow-release pantry, a sponge, and an apartment building for fungi, bugs, moss, and new seedlings. A dead log is full of life.

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Why Do Bees Make Honey?

Why Do Bees Make Honey?

Question 26

Honey is bee food for winter. Flowers do not bloom all year, so a hive stores extra sugar as thick, long-lasting honey. One bee makes only a tiny amount of honey in her whole life.

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Why Do Mosquitoes Bite?

Why Do Mosquitoes Bite?

Question 27

Not every mosquito bites people. Many sip plant juices, and only some females take a tiny blood meal, because they need extra protein to make eggs. So a bite is really an egg-making mission.

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Why Do Spiders Spin Webs?

Why Do Spiders Spin Webs?

Question 28

A web is a hunting net and a home alarm. Spider silk is liquid protein that hardens in air into a thread that is very strong for its size. Let's watch a spider build one!

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Why Do Ants Walk in a Line?

Why Do Ants Walk in a Line?

Question 29

The line is a smell road. A finder ant lays a scent trail from food to the nest, so the rest of the team can follow without a map. Let's watch an ant road form!

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Why Do Fireflies Glow?

Why Do Fireflies Glow?

Question 30

The glow is a living lantern, used as a signal. Many fireflies flash to find a mate, and some young larvae glow too, as a keep-away warning. There are over 2,000 kinds of fireflies in the world.

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Why Do Butterflies Start as Caterpillars?

Why Do Butterflies Start as Caterpillars?

Question 31

A butterfly is one animal with two jobs. The caterpillar is the eating machine, and the adult is the flying, mating, nectar-sipping machine. In between, the body is rebuilt in a change called metamorphosis.

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Why Do Worms Come Out After Rain?

Why Do Worms Come Out After Rain?

Question 32

Wet ground fills the worm's tunnels with water. Worms breathe through damp skin, and coming up is often easier than staying in a flooded tube. Rain is also a good time to travel!

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Why Do Ladybugs Have Spots?

Why Do Ladybugs Have Spots?

Question 33

Bright red and black is a warning sign. Many ladybugs taste bad, or can leak a bitter fluid. The spots help a bird remember, skip this snack!

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Why Do Flies Rub Their Feet?

Why Do Flies Rub Their Feet?

Question 34

A fly tastes with its feet. After a messy landing, rubbing its feet scrapes off dust and sticky food, so the taste sensors work again. It is not waving hello.

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Why Do Crickets Chirp?

Why Do Crickets Chirp?

Question 35

A chirp is a cricket song. Most of the night music you hear is a male, calling to a female, or warning other males away. Only the male crickets make the loud songs.

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Why Do Snails Carry Shells?

Why Do Snails Carry Shells?

Question 36

A snail shell is a portable house, grown from the snail's own body. It shields the soft parts from drying out, from bumps, and from many hungry mouths. The house is part of the animal.

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Why Do Some Bugs Look Like Sticks?

Why Do Some Bugs Look Like Sticks?

Question 37

A walking stick is an insect that looks just like a twig! That costume is called camouflage, which means hiding by matching your background. If a hungry bird cannot tell lunch from a branch, the insect gets another day.

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Why Do Moths Fly to Lights?

Why Do Moths Fly to Lights?

Question 38

Many night moths steer by a faraway light, like the moon. A porch bulb is like a fake moon that sits far too close. So instead of flying straight, the moth's path curls into a spiral.

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Why Do Ticks Hitch a Ride?

Why Do Ticks Hitch a Ride?

Question 39

A tick is a tiny hitchhiker that needs a blood meal to grow and to make eggs. It cannot fly or jump. So it waits on grass and grabs a passing animal, or even a pant leg.

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Why Do Dragonflies Hover?

Why Do Dragonflies Hover?

Question 40

Hovering is hunting in place! A dragonfly has four wings that can beat in different patterns. So it can stop, dart, and snatch a flying insect right out of the air.

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Why Can Ants Lift So Much?

Why Can Ants Lift So Much?

Question 41

An ant is small, but its muscles are thick for its size. On such a tiny body, that strength can move a crumb many times heavier than the ant. Small animals have surprising power!

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Why Do Beetles Have Hard Shells?

Why Do Beetles Have Hard Shells?

Question 42

Those shiny covers on a beetle are armor! They are the front wings, changed into a hard case. The case protects the soft flying wings folded underneath.

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Why Do Some Bugs Sting?

Why Do Some Bugs Sting?

Question 43

A sting is a last-ditch guard. Bees, wasps, and some ants use a sharp tool and venom to make a bigger animal back off. The insect is small, so the sting makes the threat feel big enough to leave its nest alone.

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Why Do Earthworms Help Gardens?

Why Do Earthworms Help Gardens?

Question 44

Earthworms are living tillers! They eat dead leaves, leave behind rich castings, and dig tunnels that let air and water into packed dirt. That makes a garden's soil healthier for plants.

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Why Do Cicadas Buzz So Loud?

Why Do Cicadas Buzz So Loud?

Question 45

That loud summer roar is a male cicada calling for a mate! Ribs in his abdomen click so fast that they make a buzz that can travel across a whole yard. It takes special body parts to be that loud.

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Why Do Spiders Have Eight Legs?

Why Do Spiders Have Eight Legs?

Question 46

Spiders are arachnids, not insects. The arachnid body plan comes with eight walking legs, while insects get six. That is one big clue for telling them apart.

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Why Do Flies Have Compound Eyes?

Why Do Flies Have Compound Eyes?

Question 47

A compound eye is a bundle of tiny lenses! Together, they make a wide, fast picture. So a fly can spot a swat coming from the side.

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Why Do Bees Dance?

Why Do Bees Dance?

Question 48

A honeybee dance is a map in motion! A finder bee tells the hive where good flowers are by walking a figure-eight on the honeycomb. It is like a little treasure map, without a single word.

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Why Do Slugs Leave a Shiny Trail?

Why Do Slugs Leave a Shiny Trail?

Question 49

The shine is slime! A slug makes mucus so its soft foot can glide over rough, dry ground. The slime also helps it stick and stay damp.

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Why Do Bugs Molt?

Why Do Bugs Molt?

Question 50

A bug's outer suit is a hard exoskeleton, and it cannot stretch. To get bigger, the animal must crawl out of the old suit. Then it waits for a new one to harden.

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Why Do Birds Sing?

Why Do Birds Sing?

Question 51

A bird song is a message! Many birds sing to claim a territory and to find a mate. The tune says, this tree is taken, and I am healthy.

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Why Do Squirrels Bury Nuts?

Why Do Squirrels Bury Nuts?

Question 52

A buried nut is a winter pantry! Food is easy to find in fall, and scarce in snow. So a squirrel hides extra nuts all around the yard.

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Why Do Baby Deer Have Spots?

Why Do Baby Deer Have Spots?

Question 53

A fawn's spots are camouflage! Sun flecks on a forest floor look a lot like a spotted fawn. And a still baby is much harder to see than a running one.

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Why Do Owls Fly So Quietly?

Why Do Owls Fly So Quietly?

Question 54

Silence is a hunting tool! An owl that whispers through the air can hear a mouse. It reaches the mouse before the mouse can hear the wings.

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Why Do Woodpeckers Peck Trees?

Why Do Woodpeckers Peck Trees?

Question 55

Pecking is a toolkit! Woodpeckers drum to talk, chip holes to nest, and tap bark to find insect larvae hiding in the wood. It is a bird with many jobs for one little beak.

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Why Do Frogs Croak After Rain?

Why Do Frogs Croak After Rain?

Question 56

Rain makes the world safer for frog eggs! Many male frogs croak after a storm to call females to fresh pools. It is a little frog concert, held in the wet.

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Why Do Snakes Shed Their Skin?

Why Do Snakes Shed Their Skin?

Question 57

A snake wears its skin like a tight sock! The sock cannot grow, so shedding lets the snake get bigger and replaces worn scales. Even the clear scale over the eye gets replaced.

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Why Do Bats Fly at Night?

Why Do Bats Fly at Night?

Question 58

Night is an open shift for hunters! Many bats hunt moths and mosquitoes after the birds that hunt by sight have gone to roost. And bats have a special trick for finding food in the dark.

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Why Do Beavers Build Dams?

Why Do Beavers Build Dams?

Question 59

A dam makes a beaver pond! Deep, still water hides the lodge door from land hunters. It also lets the family swim to their food in winter, under the ice.

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Why Do Ducks Have Webbed Feet?

Why Do Ducks Have Webbed Feet?

Question 60

Webbed feet are living paddles! The skin between the toes turns each kick into a bigger push through the water. That is why ducks swim so well.

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Why Do Rabbits Freeze, Then Run?

Why Do Rabbits Freeze, Then Run?

Question 61

Freeze is camouflage, and run is plan B! A still rabbit is harder to spot. If a hunter gets too close, long hind legs launch a zigzag escape.

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Why Do Porcupines Have Quills?

Why Do Porcupines Have Quills?

Question 62

Quills are a stay-back fence! They are modified hairs with tiny barbs. A predator that bites gets a mouthful of trouble, and learns to pick other food.

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Why Do Turtles Hide in Shells?

Why Do Turtles Hide in Shells?

Question 63

A turtle's shell is its skeleton on the outside! The ribs and backbone are joined to that armor, so the turtle can never take its house off. When danger comes, the soft parts just pull in.

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Why Do Geese Fly in a V?

Why Do Geese Fly in a V?

Question 64

A V is teamwork in the sky! Each bird rides a little lift from the swirl at the wingtip of the bird ahead. So the flock saves energy on long trips.

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Why Do Skunks Spray?

Why Do Skunks Spray?

Question 65

Spray is a last warning that became a superpower! The smell is so strong that most hunters decide this snack is not worth it. But a skunk would rather not use it.

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Why Do Hummingbirds Hover?

Why Do Hummingbirds Hover?

Question 66

Hovering lets a hummingbird drink from a flower that cannot hold its weight! The bird is a tiny helicopter with a straw. It hangs in the air while it sips.

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Why Do Wolves Howl?

Why Do Wolves Howl?

Question 67

A howl is long-distance talk! Pack members can find each other, and claim a valley. They can rally for a hunt without walking the whole forest.

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Why Do Raccoons Have Clever Hands?

Why Do Raccoons Have Clever Hands?

Question 68

Raccoon front paws are sensitive grabbers! They can feel under water, pop latches, and turn objects. A raccoon explores the world the way your fingers explore a pocket.

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Why Do Deer Grow Antlers?

Why Do Deer Grow Antlers?

Question 69

Antlers are a seasonal crown! Male deer grow them to show strength, and to spar with rivals in the fall breeding season. Then the crown falls off, and a new one starts.

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Why Do Some Animals Play Dead?

Why Do Some Animals Play Dead?

Question 70

Playing dead is a last trick! Some hunters want a chase. A still animal looks like a meal that has already gone bad. The animal is not pretending for fun. The freeze can be automatic when fear is at its peak.

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Why Do Birds Migrate?

Why Do Birds Migrate?

Question 71

Migration is a food-and-weather trip! When insects and berries fade and the cold comes, many birds fly to places that still have meals. They can also nest more safely there later.

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Why Do Foxes Have Bushy Tails?

Why Do Foxes Have Bushy Tails?

Question 72

A fox tail is a tool kit! It is a winter blanket, a balance pole, and a signal flag, all in one fluffy wrap. No wonder it is so bushy.

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Why Do Tracks Look Different in Mud?

Why Do Tracks Look Different in Mud?

Question 73

Mud works like a stamp pad! Soft, wet ground squishes down and takes a deep, sharp print, while dry dust gives a faint, blurry one. The very same foot can look huge in deep mud, and tiny on hard dirt.

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Why Do Some Animals Come Out Only at Night?

Why Do Some Animals Come Out Only at Night?

Question 74

Night is a different work shift! When the air is cooler, there are fewer daytime hunters around, and there's a buffet of moths and mice. So darkness is a great time to clock in.

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Why Can Tracks Tell a Story?

Why Can Tracks Tell a Story?

Question 75

A track is like a sentence! A whole line of tracks is like a paragraph. Together they can say who walked here, which way they went, how fast, and whether anyone else joined the walk.

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Why Is the Sky Blue?

Why Is the Sky Blue?

Question 76

Sunlight is a mix of all colors! Tiny air molecules bounce the short blue waves around much more than the other colors, so blue light fills the sky from every direction. That bouncing is called scattering.

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Why Do Clouds Look Fluffy?

Why Do Clouds Look Fluffy?

Question 77

A fluffy cloud is a crowd of tiny water drops or ice crystals floating together! From the ground, the crowd looks like cotton, because light bounces off all those drops. Each drop is so small it barely falls.

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Why Does Rain Fall?

Why Does Rain Fall?

Question 78

Cloud drops start out tiny! When they bump into each other and grow heavy enough, the air can't hold them up anymore. Gravity wins, and the rain falls.

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Why Does Thunder Follow Lightning?

Why Does Thunder Follow Lightning?

Question 79

Lightning is a giant spark! It heats the air so fast that the air explodes outward. That shock wave is thunder. About 5 seconds between flash and boom means the storm is roughly 1 mile away.

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Why Do Puddles Disappear?

Why Do Puddles Disappear?

Question 80

A puddle doesn't vanish into nowhere! Some of the water soaks into the ground. The rest turns into invisible vapor and joins the air.

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Why Does the Wind Blow?

Why Does the Wind Blow?

Question 81

Wind is air on the move! The sun warms some places more than others. Warm air rises, and cooler air slides in to take its place. Wind is invisible. We see what it pushes, like flags, leaves, and waves.

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Why Do We See Rainbows?

Why Do We See Rainbows?

Question 82

A rainbow is sunlight split apart and sent back by raindrops! Each drop acts like a tiny prism and a tiny mirror at the same time. And the whole bow is made of millions of drops.

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Why Does Dew Appear in the Morning?

Why Does Dew Appear in the Morning?

Question 83

Dew is water from the air that condensed on cool surfaces overnight! It didn't rain. The grass simply got cold enough for water vapor to turn back into drops.

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Why Do Lakes Freeze From the Top?

Why Do Lakes Freeze From the Top?

Question 84

Ice is lighter than liquid water, so it floats! Cold air nips the surface first, and the ice lid then covers the water below like a blanket. That means fish can keep living underneath.

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Why Do Rivers Flow Downhill?

Why Do Rivers Flow Downhill?

Question 85

Gravity pulls water toward the lowest spot it can reach! A river is rain and melted snow sliding downhill in a channel, headed for a lake or the sea. Water can't hold a pile, so it always finds lower ground.

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Why Do Waves Keep Coming?

Why Do Waves Keep Coming?

Question 86

Most waves are wind energy traveling through water! The water mostly just goes up and down. It's the energy that keeps rolling toward the shore.

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Why Is the Ocean Salty?

Why Is the Ocean Salty?

Question 87

Rivers carry tiny bits of dissolved rock and salt to the sea! Water evaporates from the ocean, but the salt stays behind, and slowly builds up. It takes a very long time.

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Why Does Fog Hug the Ground?

Why Does Fog Hug the Ground?

Question 88

Fog is a cloud that formed at ground level! When cool air near the ground makes water vapor condense, you get tiny drops that you can walk through. Those drops hang right where the cooling happened, down low.

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Why Do We Have Seasons?

Why Do We Have Seasons?

Question 89

Earth is tilted! As it goes around the sun, one half leans toward the sun for part of the year, and away for the other part. That tilt is what makes the seasons.

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Why Does Snow Sparkle?

Why Does Snow Sparkle?

Question 90

Snow is a pile of tiny ice crystals! Their flat faces act like little mirrors. When the sun hits those faces just right, you see flashes.

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Why Do Icicles Hang From Roofs?

Why Do Icicles Hang From Roofs?

Question 91

An icicle is meltwater that froze again on the way down! A warm patch of roof melts the snow. Then the drip hits cold air, and builds a hanging spike.

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Why Does the Moon Look Bigger Some Nights?

Why Does the Moon Look Bigger Some Nights?

Question 92

A huge moon near the horizon is mostly a trick of the brain! Trees and houses give the moon neighbors to compare with, so it looks giant. High in the empty sky, it looks smaller.

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Why Do Stars Twinkle?

Why Do Stars Twinkle?

Question 93

Stars don't really blink on and off! It's our air that is jumpy. Pockets of warmer and cooler air bend the starlight as it comes in, so the point of light seems to dance.

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Why Is Sunset Orange and Red?

Why Is Sunset Orange and Red?

Question 94

At sunset, sunlight takes a much longer path through the air! On the way, the blue light gets scattered out of the beam. The leftover light that reaches your eyes is orange and red.

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Why Do We Have Day and Night?

Why Do We Have Day and Night?

Question 95

Earth spins like a top! The half facing the sun has day, and the half turned away has night. One full spin takes about 24 hours. It is always daytime somewhere on Earth.

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Why Do We See Our Breath in Winter?

Why Do We See Our Breath in Winter?

Question 96

Your breath is warm and damp! Cold air can't hold all that water vapor, so it turns into a tiny fog right in front of your mouth. That's the puff you see.

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Why Does a Compass Point North?

Why Does a Compass Point North?

Question 97

Earth is a giant magnet! A compass needle is a tiny magnet that can spin freely. It lines up with Earth's magnetic field, so one end points near geographic north.

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Why Does Frost Paint the Grass?

Why Does Frost Paint the Grass?

Question 98

Frost is dew's frozen cousin! When grass gets colder than freezing, water vapor can turn straight into ice crystals on the blades. It paints the grass white.

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Why Do Storms Have Calm and Wild Parts?

Why Do Storms Have Calm and Wild Parts?

Question 99

A storm is like a weather engine with different rooms! Rising warm air, falling rain, and spinning winds are not the same in every spot. So one minute can roar, and the next can hush.

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Why Can a Weather Forecast Miss?

Why Can a Weather Forecast Miss?

Question 100

Weather is a giant puzzle with too many moving pieces! A forecast is the best science guess from computer models, satellites, and radars. It's not a promise carved in stone.

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Why Do Ponds Get a Green Film in Summer?

Why Do Ponds Get a Green Film in Summer?

Question 101

That green film is often algae! Algae are tiny plant-like living things. With warm sun, still water, and extra nutrients, they bloom into a scum you can see.

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Why Do Frogs Start as Tadpoles?

Why Do Frogs Start as Tadpoles?

Question 102

A tadpole is a frog's water-baby shape! Frog eggs are laid in water, so the first body is built for swimming and eating pond food. Later it rebuilds itself for life on land.

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Why Do Ducks' Feathers Shed Water?

Why Do Ducks' Feathers Shed Water?

Question 103

Duck feathers overlap like shingles on a roof! A duck also gets a thin coat of oil from a gland near its tail, so water beads up and rolls off instead of soaking in. It's a built-in raincoat.

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Why Do Some Fish Swim in Schools?

Why Do Some Fish Swim in Schools?

Question 104

A school is a moving crowd of fish! Many eyes spot danger, and the group can twist together, so a hunter has a harder time picking just one fish. There's safety in numbers.

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Why Do Water Striders Walk on Water?

Why Do Water Striders Walk on Water?

Question 105

A pond has a thin skin called surface tension! A water strider is light, and its long legs spread out its weight. Its hairy feet make little dimples in the skin, instead of punching through.

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Why Do Mosquitoes Hatch Near Water?

Why Do Mosquitoes Hatch Near Water?

Question 106

Mosquito babies are aquatic! Eggs are laid on still water. The wrigglers breathe at the surface and eat tiny bits until they become flying adults.

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Why Does a Stream Make a Bubbling Sound?

Why Does a Stream Make a Bubbling Sound?

Question 107

Moving water slams into rocks and folds over itself! Air gets trapped in the water and pops. Those pops, plus the rush of the water, are the stream's voice.

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Why Do Crayfish Hide Under Rocks?

Why Do Crayfish Hide Under Rocks?

Question 108

A crayfish is a snack with a shell! Rocks, logs, and burrows hide it from fish, birds, and raccoons. The dark gap is both a fortress and a hunting blind.

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Why Do Cattails Grow in Wet Ditches?

Why Do Cattails Grow in Wet Ditches?

Question 109

Cattails are wetland plants. Their roots like soggy soil, and their stems are built to stand in shallow water. A wet ditch stays wet for a long time, so it is a perfect home for them.

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Why Do Turtles Bask on Logs?

Why Do Turtles Bask on Logs?

Question 110

Turtles are cold-blooded, so they use the sun as a heater. Water steals heat, but air and sunshine give it back. A log is a dry, safe bench where a turtle can warm up.

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Why Do Beavers Build Dams? Nature's Engineers

Why Do Beavers Build Dams? Nature's Engineers

Question 111

A dam is a beaver's tool for making deep, still water. Beavers are nature's engineers. Their pond is a safe home that protects the family, like a moat around a castle.

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Why Do Snails Leave Shiny Trails?

Why Do Snails Leave Shiny Trails?

Question 112

The shine is mucus, a slippery slime that a snail makes itself. It works like a lubricant and a glue. It lets the snail slide along without tearing its soft foot.

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Why Do Salamanders Like Damp Logs?

Why Do Salamanders Like Damp Logs?

Question 113

Many salamanders breathe partly through thin, wet skin. Dry air can pull water out of that skin. The underside of a damp log stays cool and moist, so it works like a humid little cave.

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Why Do Wetlands Soak Up Floods?

Why Do Wetlands Soak Up Floods?

Question 114

A wetland is like a giant sponge. Water spreads out into shallow basins, and plants and spongy ground hold it. Then the water drips out slowly, instead of rushing downstream all at once.

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Why Do Caddisfly Larvae Wear Stick Suits?

Why Do Caddisfly Larvae Wear Stick Suits?

Question 115

A caddisfly larva has a soft body. It builds a portable case, like a tiny suit, to hide inside. The suit is a walking cave made of sand, sticks, or stones.

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Why Do Frogs Croak After Rain? The Pond Chorus

Why Do Frogs Croak After Rain? The Pond Chorus

Question 116

Rain makes travel and breeding easier for frogs. Wet ground does not dry out their skin, and puddles and ponds fill up. Many male frogs call to say, I am here, and to attract a mate.

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Why Do Some Ponds Freeze While Springs Stay Open?

Why Do Some Ponds Freeze While Springs Stay Open?

Question 117

A still pond loses heat at its surface and can grow an ice lid. A spring has moving water that comes from underground. That water is not winter-cold, and it keeps moving, so ice has a hard time forming.

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Why Do Ducks Dabble Upside Down?

Why Do Ducks Dabble Upside Down?

Question 118

Dabbling is shallow-water grocery shopping. A duck tips its tail up and its head down to reach food on the bottom. Plants, seeds, and tiny animals are waiting in the mud.

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Why Should You Not Drink Stream Water?

Why Should You Not Drink Stream Water?

Question 119

Clear water can still hide germs. You cannot see viruses or many bacteria, so pretty water is not always safe water. Streams pick up droppings and runoff from animals, fields, and roads.

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Why Is the Forest Louder at Night?

Why Is the Forest Louder at Night?

Question 120

For many animals, night is rush hour. Frogs, insects, owls, and mammals that hide by day clock in for their night shift. The woods are not angry or scary.

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Why Do Fireflies Light Up?

Why Do Fireflies Light Up?

Question 121

A firefly's glow is a chemical lantern in its belly. A special reaction makes cold light with almost no heat. Each species blinks in its own pattern, like a secret code that says, I am here, and I am your kind.

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Why Do Owls Fly So Quietly? Think Like the Mouse

Why Do Owls Fly So Quietly? Think Like the Mouse

Question 122

An owl hunts mostly by listening, and a mouse has sharp ears too. If the owl's wings were loud, the mouse would hear a warning and run away, so owls are built to hush the air.

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Why Do Bats Zip Around at Dusk?

Why Do Bats Zip Around at Dusk?

Question 123

Dusk is insect rush hour. Many bats are night fliers that hunt with sound, and they zip where mosquitoes and moths rise. One bat can eat a big pile of night insects in an evening.

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Why Do Some Flowers Smell Stronger at Night?

Why Do Some Flowers Smell Stronger at Night?

Question 124

Some plants clock their perfume for moths and other night pollinators. Color is harder to see after dark, so scent becomes the billboard. A flower that seems shy at noon can own the yard at 9 p.

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Why Do Raccoons Look So Busy After Dark?

Why Do Raccoons Look So Busy After Dark?

Question 125

Raccoons are night-shift generalists, which means they eat almost anything. Dark hours mean fewer people and some easier prey. Their super-sensitive front paws can feel for food, like extra eyes.

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Why Do Moths Fly at Lights?

Why Do Moths Fly at Lights?

Question 126

Many moths steer by a distant light, like the moon. Keeping it at a steady angle works like a night compass. A nearby bulb is a fake moon, so the moth is not in love with your lamp.

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Why Do We Hear Coyotes at Night?

Why Do We Hear Coyotes at Night?

Question 127

Howls and yips are messages. Coyotes use them to say, we are here, and to keep in touch with family and neighbors. Night is when coyotes hunt and travel, and people and heat are lower then.

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Why Do Eyes Shine in a Flashlight?

Why Do Eyes Shine in a Flashlight?

Question 128

Many night animals have a mirror layer at the back of the eye called the [tapetum, tah-PEE-tum]. Light goes in, bounces off it, and comes back out. That bounce gives the eye a second chance to catch the light, and it makes the eye shine in your beam.

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Why Do Slugs Come Out After Dark?

Why Do Slugs Come Out After Dark?

Question 129

A slug is like a water balloon with a foot. Its slime needs moisture, and daytime sun and dry air can dry it out. After dark the ground is cooler and damper, so it is the perfect time for a slug to go out.

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Why Do Some Animals See Well at Night?

Why Do Some Animals See Well at Night?

Question 130

Night hunters pack extra tools into their eyes. A wide pupil lets in more light, and special cells called rods catch dim light. Many also have a mirror layer that gives light a second chance to be seen.

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Why Do Night Insects Sound Like a Band?

Why Do Night Insects Sound Like a Band?

Question 131

Crickets, katydids, and some frogs all clock in as night singers. Each species has its own instrument and its own pattern and tempo. So the woods sound like a messy, wonderful orchestra.

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Why Do Porcupines Wander After Dusk?

Why Do Porcupines Wander After Dusk?

Question 132

A porcupine is a slow, night-shift plant eater. Dusk means fewer busy roads, and wandering lets this clumsy climber work while many hunters nap. Its quills are a warning coat, not a thrown spear.

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Why Do Night Hikers Use Red Light?

Why Do Night Hikers Use Red Light?

Question 133

Rod cells in your eyes do most of your night vision, and they respond much less to red light. A dim red light lets your eyes stay dark-adapted. A bright white beam wipes out that adaptation and can startle animals.

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Why Do Crickets Chirp After Sunset?

Why Do Crickets Chirp After Sunset?

Question 134

A male cricket rubs a file on one wing against a scraper on the other wing to make a chirp. The chirp is a night advertisement that says, I am here, and I am your kind. Cooler, darker hours hide him from some hunters that use sight.

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Why Do Deer Freeze in Headlights?

Why Do Deer Freeze in Headlights?

Question 135

A sudden blast of bright light can overwhelm a night-adapted eye. It is like a noon sun switched on in one second. The deer is not being brave or silly.

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Why Do Mushrooms Seem to Pop Up Overnight?

Why Do Mushrooms Seem to Pop Up Overnight?

Question 136

The mushroom you see is just the fruit. The real body of the fungus is a hidden web of threads in the wood or soil. That web may have been there for months, and then water helps the cap swell up fast.

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Why Do Trail Markers Matter in the Dark?

Why Do Trail Markers Matter in the Dark?

Question 137

Night steals the landmarks. Trees look alike after dusk, and your brain has fewer clues to use. A painted mark or a numbered post is a signal that says, this is still the path.

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Why Should You Not Follow Glowing Eyes Off-Trail?

Why Should You Not Follow Glowing Eyes Off-Trail?

Question 138

Glowing eyes are a clue, not an invitation. Off the trail there are roots, holes, and water, and you can lose the path fast. The animal also loses its calm, so it is best for both of you if you watch from the path.

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Why Does a Campfire Look Extra Bright at Night?

Why Does a Campfire Look Extra Bright at Night?

Question 139

The fire did not get hotter just because the sun left. Your eyes adapted to the dim woods, so the same flames look like a spotlight. A small bright flame against black trees also makes a huge contrast.

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Why Do We Hear More When We Stop Walking?

Why Do We Hear More When We Stop Walking?

Question 140

Your own feet, jacket, and whispers are like a marching band. When you freeze, that band stops, and the real woods can reach your ears. Stopping also lets your eyes finish adapting to the dark.

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Why Do Some Trees Creak at Night?

Why Do Some Trees Creak at Night?

Question 141

Wood is not a silent statue. Wind, cooling air, and branches rubbing together can all make a tree groan. A creak can sound like footsteps, but it is usually just the tree working.

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Why Do Night Hikers Stay Together?

Why Do Night Hikers Stay Together?

Question 142

Staying together is how you get the story home. A group shares lights, maps, and the job of watching. Teamwork is a science tool, and detectives do not wander off alone.

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Why Do a Map and a Grown-Up Beat Wandering?

Why Do a Map and a Grown-Up Beat Wandering?

Question 143

Curiosity is the engine, but a map and a grown-up are the steering wheel. Night wandering turns a question into a search party. Wonder still happens on a marked loop with a plan.

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How Do You Think Like a Nature Detective?

How Do You Think Like a Nature Detective?

Question 144

A nature detective asks why, looks twice, and leaves the scene better than they found it. Clues are tracks, songs, weather, and timing, and you collect them with your eyes and a notebook, not by taking animals home. Scientists work this way too, with careful eyes and a lot of patience.

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Why Do Dragonflies Dart Over Ponds?

Why Do Dragonflies Dart Over Ponds?

Question 145

Dragonflies dart over ponds because a pond is their hunting ground! Ponds are full of tiny flying insects, and the water is where baby dragonflies grow up. So grown-up dragonflies zoom back and forth over the water, looking for a snack.

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Why Is Pond Water Brown Sometimes?

Why Is Pond Water Brown Sometimes?

Question 146

Pond water turns brown when bits of nature get mixed into it! Soil washes in with the rain, and old leaves soak in the water like a tea bag. Both can color the pond.

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Why Do Tadpoles Lose Their Tails?

Why Do Tadpoles Lose Their Tails?

Question 147

A tadpole's tail doesn't fall off. Its body slowly uses it up! The tail is a swimming tool, and a froglet doesn't need it. This big body change is called metamorphosis.

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Why Do Herons Stand So Still?

Why Do Herons Stand So Still?

Question 148

Herons stand still because they are hunting! Fish and frogs can see movement, so a heron holds very quiet in the shallow water. When prey swims close, the heron strikes in a flash.

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Why Do Minnows Hide in Weeds?

Why Do Minnows Hide in Weeds?

Question 149

Minnows hide in weeds because the weeds keep them safe! Minnows are small, so bigger fish, birds, and turtles love to eat them. A thick patch of plants gives them cover, shade, and food all in one spot.

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Why Do Lily Pads Float?

Why Do Lily Pads Float?

Question 150

Lily pads float because they are flat, light, and full of air! Each pad is wide and thin, like a raft. Tiny air spaces inside make it even lighter.

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