Blue whale
The blue whale is the biggest animal in the world. A blue whale is long – it is as long as 3 buses. It is heavy too – as heavy as 20 elephants. Its heart is as big as a car.
It has a big mouth but it just eats tiny animals called krill. Blue whales must eat lots of tiny krill.
By Øystein Paulsen - MAR-ECO. CC BY-SA 3.0.
It is the biggest mammal in the world. A mammal has lungs so a whale must breathe air out of the sea.
A blue whale skeleton