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Text: Gallery Interactives. Games and facts from our galleries. Illustrations: Silhouettes of animals, from our gallery icons.
Mammal Skulls
Mammals can be traced back to an early branch of reptiles, called therapsids, which lived long before dinosaurs, birds and even lizards evolved. These early mammal-like reptiles shared similar features to modern mammals, but it was only in the Triassic Period that we start to see the first true mammals. There are three important characteristics that only mammals have.
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