That is an Ambulocetus, a bizarre beast. He is a predator.
— Allen, describing Ambulocetus

Ambulocetus (name meaning "Walking Whale") is a genus of cetacean that originated during the Early Eocene epoch in what is now Europe. Measuring around 3 meters long, it was essentially a bizarre, primitive whale-like beast with crocodilian-like attributes.

Ambulocetus first appeared in the Series 3 premiere "The Little Roo", where a single large male, named Nate, was rescued from Germany 50 million years ago due to a poisonous gas that would have killed him. Nate resides in the Whale Watching exhibit of the park. He was also eventually given a mate, named Amcee.


Era & DiscoveryEdit

Among the apex predators of its time, Ambulocetus lived during the Early to Middle Eocene epoch, over 50 – 41 million years ago. Ambulocetus was recovered from the Kuldana Formation of Punjab, Pakistan in 1993 by Johannes G.M.

Physical AttributesEdit

Reaching a size of up to 10 feet (3 m) long and weighing more than 1500 lbs. (700 kg), Ambulocetus was a carnivore that waddled awkwardly on land. In water, however, they were faster and more agile. Although their ancestors hunted on land, Ambulocetus evolved to be far more at home in the water. In fact, their descendants took this aquatic lifestyle to an even greater extreme.

Although Ambulocetus may appear as a kind of mammalian crocodile, they are in fact ancestors of whales; their overall body shape itself is the very earliest form of whales. Hence their name, "Ambulocetus", literately means "Walking Whale". Their styles of swimming 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 and crocodiles they shared their waters with.

Behavior & TraitsEdit

Living in anything from large ponds to even shallow coastlines, Ambulocetus was arguably the most powerful predator in its entire ecosystem. Much like crocodiles, they often prepared ambushes near the shores of lakes, rivers, and ocean coasts.

Despite the fact that they didn't possess ears, Ambulocetus listened for incoming prey by placing their jaws directly on the ground and detecting vibrations. It was the same mechanism that allowed them to hear underwater as well. Their killing techniques were simple, similar to crocodiles: their vice-like jaws held the struggling prey until it drowned.

Journal Entry Edit

Measuring 3 meters long, Ambulocetus is a strange-looking whale-like beast with crocodile-like attributes. However, despite looking like a crocodile, Ambulocetus's overall physical appearance is the earliest known form of whales, as its name literately means "Walking Whale".

When swimming, Ambulocetus's body movement was identical to that of an otter; moving in an up and down rather than side to side, like fish and crocodilians.

Like crocodiles, Ambulocetus was an ambush predator; lying in wait close to the shore. And once its prey got close, it grabbed them and dragged them down to the depths. Ambulocetus could live in rivers, ponds, lakes, and even coastal shorelines.

Ambulocetus did not possess ears, however, they listened for vibrations via placing their jaws on the ground. They did this both in the water and on land.

— Allen, in his Journal, about Ambulocetus



  • Ambulocetus has often been described as a mammalian crocodile or crocodilian-like mammal.
  • The sounds effects of Ambulocetus are a mix of crocodile, sea lion, seal, and walrus sounds.
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