Pakicetus (meaning "Pakistan whale") was a type of terrestrial carnivore from the Eocene. It is thought to be the the oldest known ancestor to whales, along with Ambulocetus . Its lifestyle is unknown, as its ear structure is devolped to work better in the air, while types such as Ambulocetus had ears structures devolped to work better when submerged. This shows Pakicetus may spent more time out of the water.

The bones show a dense growth, which appears in animals that spend a lot of time in the water. It also had eyes near the top of the skull, which shows it may have hunted by lurking in the water like a crocodile.

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