Chip Chick A New Prehistoric Dolphin Species Has Been Discovered, And They Have Excellent High-Frequency Hearing Abilities A new prehistoric dolphin species has been discovered, and it had ...

They evolved separately around 250 million years ago, possibly from a crocodile-like ancestor, to resemble fish and modern dolphins. Then, they went extinct around 94 million years ago.

They evolved separately around 250 million years ago, possibly from a crocodile-like ancestor, to resemble fish and modern dolphins. Then, they went extinct around 94 million years ago. In 2010, ...