Basilosaurus was an enormous whale that was the top predator of the Eocene sea. It was about 60 feet long and was the biggest carnivourous whale to ever swim in the seas. Its diet consisted of squid and a smaller and much faster whale/seal creature called a Dorudon, which was nerly 9 times smaller than basilosaurus! Usually it would grab it alive and throw it onto land then bite its head off to scoff the inside of the prey.

Basilosaurus closeup

a basilosaurus