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In what period did mammals develop? |
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Mammals were around when the dinosaurs were still succesful, they were small and nocturnal burrowers mainly. They probably evolved from the burrowing, mouse like, "mammal like reptiles" during the Permian period. When the mass exctinction happened 65mya (million years ago), the small mammals had a chance to take over.
First answer by ID3460964006. Last edit by Foxmeister. Contributor trust: 12 [recommend contributor]. Question popularity: 44 [recommend question]
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