Instead, they use the blowholes on the top of their head to breathe air at the ocean's surface. Whales evolved from a deer-like land mammal called Pakicetus about 50 million years ago. A sperm whale's ...

They include some of the largest animals on Earth. The blue whale is the biggest animal that has ever existed. Whales can be found in every ocean, with many species migrating long distances ...

The huge creature, which 'can be seen from space', was discovered entirely by accident by divers exploring a wreck ...