Purgatorius hiding from a Tyrannosaur. Computer artwork of a shrew-like Purgatorius sp. mammal hiding from a Bistahieversor sp. tyrannosaur amongst the undergrowth of a cretaceous forest, in what is now the western USA. Purgatorius were small omnivorous mammals that are believed to be among the earliest ancestors of modern-day chimpanzees, rhesus monkeys, and humans.
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