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Home > Discover Nature! > Gallery Interactives > Fossils > Mammal
Skulls

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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Last Update: 2007-04-30