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Why was dinosaurs around?

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Anonymous

17y ago
Updated: 8/16/2019

Actually dinosaurs and mammals began at about the same time (some 200 million years ago) and lived side by side for millions of years ... but the dinos won and wiped out all the early mammals except for the little, nocturnal ones like mice (our ancestors).

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Wiki User

17y ago

What else can I help you with?