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There are three main categories of dinosaur eggs: (sauropods and hadrosaurs
as we know them
the shale and the fossils become very unstable and they turn to powder
but belong to relatively small Protoanisopterans and Zygopterans (damselflies)
Dimetrodon Skeleton, juvenile Alamosaurus There are three main categoriesJuvenile Dimetrodon Skeleton, Permian Of North America Dimetrodon (meaning two measure teeth) was a sail backed, meat eating animal that lived during the Permian Period, roughly 280 MYA years ago, before the dinosaurs evolved. It was a so called mammal like reptile, a pelycosaur; pelycosaurs were the ancestors of the mammals. Dimetrodon was a dominant carnivore during the Permian period, living mainly in swampy areas. Unlike their fellow non finned
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