Basilosaurus

Basilosaurus was a prehistoric whale from the Late Eocene, about 40 to 35 million years ago.

Description
Basilosaurus was extremely long for a whale, because of its elongated verterbrae. It has been described as the closest a whale came to a snake. Basilosaurus was 18-21 metres long, and its back limbs, being 0.6 metres long, were of no use in locomotion.

Its large, conical teeth were probably used for eating smaller whales, sea cows, and turtles. A skeleton recovered in Egypt contained fishbones and the remains of a small shark.

In popular culture
Basilosaurus has appeared in Walking with Beasts, and the Walking with Dinosaurs special Sea Monsters.