Assertion: cetacean's ancestor | /r/HasProperty | mesonychid
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Source sentences:
text: The most likely ancestors were long thought to be mesonychids — large, carnivorous animals from the early Cenozoic (Paleocene and Eocene), which had hooves instead of claws on their feet.
text: For a long time, paleontologists thought the ancestors of whales were the mesonychid, a group of carnivorous ungulates with a controversial systematic position, because of the similar nature of the skull and teeth.