💡 Động vật biển — Fun Facts

A starfish can grow a new arm if it loses one.

If a starfish loses an arm, it can slowly grow a brand new one to take its place.

The whale shark is the biggest fish in the sea.

It is about as long as a bus, but it is very gentle and eats mostly tiny sea creatures.

Dolphins come up to the surface to breathe air.

Even though they live in the sea, dolphins are not fish and must breathe air like us.

A jellyfish has no bones, no heart, and no brain.

It is mostly made of water and simply drifts along with the ocean currents.

Clownfish live safely among the waving arms of a sea anemone.

A special slimy coat keeps the clownfish from being stung, so the anemone becomes its cozy home.

A pufferfish can puff up like a balloon.

When it feels worried, it gulps water and blows up into a round, spiky ball.

A seahorse dad is the one who carries the babies.

The father seahorse keeps the eggs safe in a special pouch until the babies are ready to swim out.

The Greenland shark can live for hundreds of years.

Scientists think Greenland sharks can live around 400 years, making them the longest-living animals with a backbone.

The colossal squid has the biggest eyes of any animal.

Its eyes can be about 27 cm across — as big as a dinner plate — which help it see in the dark, deep parts of the ocean.

The blue whale is the biggest animal that has ever lived — bigger than any dinosaur.

A blue whale can grow to about 30 metres long and weigh as much as 30 elephants. Its heart is roughly the size of a small car, and a blue whale calf can gain around 90 kg a day just from its mother's milk.

Dolphins give each other names using special whistles.

As a baby, each dolphin invents its own unique 'signature whistle', and other dolphins can copy that whistle to call it — much like using a name.

Starfish don't have a brain.

A starfish has no brain and no blood. Instead it uses a simple network of nerves and moves seawater through its body to power hundreds of tiny tube feet. Many starfish can even regrow a lost arm.

A shrimp's heart is in its head.

A shrimp's heart sits just behind its head, in the front part of its body called the thorax — so it really does look like the heart is in the head. Many of its other organs are packed in there too.

Sea otters hold hands while they sleep so they don't float apart.

Sea otters rest floating on their backs, and holding paws — called 'rafting' — keeps the group together so no one drifts away on the current. They also wrap themselves in seaweed to stay anchored in one spot.

Octopuses have three hearts and blue blood.

Two of the hearts pump blood to the gills, and the third pumps it to the rest of the body. Their blood is blue because it carries oxygen using a copper-based molecule called hemocyanin, instead of the iron-based hemoglobin that makes our blood red.