Expressing surprise and disbelief

Some octopuses can be poisonous.

The giant Goliath bird-eater spider can cover the head of a man.

Giraffes clean their ears with their tongues.

Camels don't sweat, so their humps are full of water.

The mantis shrimp has a special front arm that can heat surrounding water up to 4,700°C

Crocodiles can't stick out their tongues.

Sharks grow around 30,000 teeth in their lifetime.

Polar bears cover their black noses with a paw when they want to hide in the snow.

Kangaroos can't walk backwards.

Rats clean themselves frequently. They even wash their faces with water.

A bird called the Egyptian plover goes inside a crocodile's mouth to clean its teeth and then flies out safely.

Hippos sweat a red-pink version of blood.