|“||Ambulocetus, a bizarre beast. He is a predator.||„|
|— Allen, describing Ambulocetus|
Ambulocetus ("Walking Whale") was a bizarre, prehistoric whale-like beast with crocodile-like traits that existed in the Early Eocene Period.
Ambulocetus lived in the Seas and Lakes of the Early Eocene period over 50 million years ago.
Ambulocetus was a three–meter–long carnivore that waddle awkwardly. Although their ancestors hunted on land, Ambulocetus evolved to be far more at home in the water. In fact, their descendants took this water life to an even greater extreme.
Although Ambulocetus may look a bit like a kind of mammalian crocodile, they were actually the ancestor of the whales. Their body shape itself is the very earliest form of whales. Hence their name, "Ambulocetus", means "Walking Whale".
Their styles of swimming already had the appearance of dolphins and whales – when they swam, their bodies moved up and down, as opposed to side to side like the fishes or crocodiles they shared their waters with.