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Frog Record-Breakers: Tiny, Giant, See-Through and Frozen Solid!

2026-10-24 · Watch on YouTube

Summary

Meet four record-breaking frogs: one smaller than your fingernail, one as heavy as a small house cat, one you can see right through, and one that freezes solid all winter and hops away in spring! Count down the most amazing frogs on Earth and discover the secret that links all their records together.

Transcript

0:00Frozen Frog Mystery

Right now, somewhere in a snowy forest, a frog is frozen as hard as an ice pop. Its heart is not beating. And when spring comes, it will hop away like nothing happened! How is that even possible? Frogs are full of world records. One frog is smaller than your fingernail. Another is as heavy as a small house cat. One is so see-through you can watch its heart beat. So today, we are counting down four frog record-breakers to find out which one has the most amazing trick of all. Get your best hopping legs ready. Our first record-breaker is so small, you could walk right past a whole family of them and never notice. Let's go looking!

0:41The Tiniest Frog

Number four: the tiniest! Deep in the rainforests of Papua New Guinea, on the damp forest floor, lives the Amau frog. A grown-up Amau frog is only about seven and a half millimeters long. That is smaller than your fingernail! Wow-fact: when scientists first found it, it was one of the tiniest animals with a backbone ever discovered. It lives in the crunchy layer of fallen leaves, and its brown speckled skin blends right in. Scientists found it by listening for its tiny, high-pitched chirp, which sounds more like a bug than a frog. If you ever spot a frog outdoors, remember the frog-friend rule: look, don't touch. Their skin is delicate, and watching quietly is the kindest way to say hello. But how does a frog that small even survive?

1:32Tiny Is A Superpower

Being tiny is actually a superpower. To the Amau frog, a single fallen leaf is as big as a blanket, and the forest floor is a giant maze full of hiding spots. It snacks on teeny creatures like mites, which are far too small for bigger frogs to bother with. And here's a wow-fact: most frogs start life as wiggly tadpoles in water, but the Amau frog skips that part! It hatches straight out of its egg as a teeny, tiny frog, ready to hop. So small, so clever. Now, hold on to your hats, because our next record-breaker is about as different from this little hopper as a frog can possibly be.

2:12The Biggest Frog

Number three: the biggest! Meet the Goliath frog, from rivers in western Africa. Its body can stretch to about thirty-two centimeters, about as long as a school ruler. Stretch out its back legs, and it gets even longer! And it can weigh over three kilograms, about the same as a small house cat. Now picture them side by side. On one side, the Amau frog, smaller than a fingernail. On the other, the Goliath frog, as hefty as a cat. Both of them are frogs! Wow-fact: this giant frog does not croak at all. It has no vocal sac, the stretchy balloon in the throat that most frogs use to call. So how does a silent giant look after its family?

2:56Giant Frog Builders

With some serious muscle! Scientists discovered that Goliath frogs build their own little ponds. Along the edge of rushing rivers, they push stones and scoop out gravel to make calm pools. Some of the stones they move are surprisingly heavy, even for a frog this big! Then the eggs are laid inside, where the tadpoles can grow safely, away from the fast, rough water. Wow-fact: scientists were amazed, because very few frogs build nests like this at all. That makes Goliath frogs real frog builders! Tiny frog, giant frog, both pretty amazing. But our next record-breaker has a trick you can actually see right through.

3:37The See-Through Frog

Number two: the most see-through! In the rainforests of Central and South America lives the glass frog. From above, it looks lime green. But look at it from below, and its belly skin is so clear you can see its insides! Wow-fact: on some glass frogs, you can actually watch the heart pumping, like looking through a little window. During the day, glass frogs sleep stuck to the underside of a leaf. Their green edges blend with the leaf, and light shines through the middle of their bodies, so they are very hard to spot. But scientists noticed something strange about sleeping glass frogs, and it changed how they saw this whole frog.

4:15The Hidden Secret

Blood is red, right? So how does a see-through frog hide its red blood? Here's the secret. When a glass frog falls asleep, it gathers almost all of its red blood cells and packs them into its liver, like putting toys away in a toy box. That makes the frog about two to three times more see-through! When it wakes up, the blood flows back out again. Awake: a bit of red. Asleep: nearly invisible. And now look back at every record so far. The tiny frog fits a world of leaf hiding spots. The giant frog builds safe pools. The glass frog almost disappears. These records are not for showing off. Each one is a clever way to stay safe! So what amazing survival trick could beat disappearing?

5:01The Frog That Freezes

Number one: the frog that freezes! Meet the wood frog, which lives in forests across North America, all the way up to chilly Alaska. When winter comes, it snuggles under fallen leaves on the forest floor. Then, as the cold creeps in, something incredible happens. Ice forms in its body. Its heart stops beating. It stops breathing. Wow-fact: up to about two-thirds of the water in its body turns to ice! It is like the frog pressed a giant pause button and waits, frozen, all winter long. Only wood frogs can do this, slowly and naturally, outdoors. Never put a frog or any animal in a freezer; it would not survive. So how does the wood frog's body pull off this frosty magic trick?

5:47Sugar Antifreeze Secret

With sugar! As the frog starts to freeze, its liver makes lots of sugar and sends it all through its body. The sugar soaks into the frog's cells, the tiny building blocks of its body, and works like antifreeze. That means the ice forms around the cells, but not inside them, so they stay safe. Here are the steps. Step one: winter arrives, and sugar spreads out. Step two: the frog freezes and its heart pauses. Step three: spring warms the forest, the ice melts, and the heart starts beating again! Wow-fact: soon after thawing, wood frogs head to ponds and call to each other with a sound like quacking ducks! So, did our frozen frog from the beginning make it to spring?

6:31Spring Riddle Time

Remember that frog frozen solid in the snowy forest? The snow is melting, the sun is warm, and look: it hops off toward a pond, quack, quack! So which frog has the most amazing trick? Every record-breaker we met uses its record to survive: tiny to hide, giant to build, see-through to vanish, and frozen to wait for spring. Now, a quick riddle. I sleep under the leaves and turn as hard as ice all winter. My heart takes a long rest. In spring, I wake up and call like a quacking duck. What am I? I am the wood frog, the frog that pressed pause on winter!

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Series: science (English)