Facts: Basilosaurus, meaning "King Lizard". It is the largest known ocean animal of the late Eocene. Basilosaurus lived 40-34 million years ago in the Bartonian to Priabonian age of the late Eocene. Basilosaurus was a toothed whale, it was a fairly slender whale, It was a early ancestor of modern whales even though it is descended from terrestrial animals like Ambulocetus. It's front flippers had elbow joints, which only some seals have today. It also had hind flippers, which used to be legs long before it evolve.

Genus: Basilosaurus. Kingdom: Animalia. Phylum: Chordata. Class: Mammalia. Order: Cetacea. Suborder: Archaeoceti. Family: Basilosauridae. Subfamily: Basilosaurinae