- Blue Whale is a type of marine mammal.
- It is the biggest animal in the world.
- Its heart weighs as much as a small car.
- A blue whale’s body is greyish blue in colour.
- Blue whales feed on krill.
- They move in groups known as pods.
- But they are usually solitary animals.
- They were hunted down extensively during the 19th century.
- This caused blue whale populations to deplete greatly.
- They are now protected by the law which bans their hunting.
