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The biggest blue whale ever recorded weighed 190 tonnes ... but their early ancestors lived on land, some resembling small deer. Over time they moved into the water, and basilosaurids are believed ...

As one of the largest predators to have ever lived, megalodon captures people's imagination ... It may have been comparable in length to today's biggest whale sharks, the largest of which has measured ...

Whales are a group of mammals that live in oceans. 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 ...

It's bigger than the biggest whale shark, which is the largest fish ... The megalodon had the strongest bite force of any animal that ever lived, three times that of a T-Rex.