http://en.wikipedia.org/wiki/Mammal
Mammals took over the medium- to large-sized ecological niches in the Cenozoic, after the Cretaceous–Paleogene extinction event emptied ecological space once filled by non-avian dinosaurs and groups of reptiles that were now absent.Then mammals diversified very quickly; both birds and mammals show an exponential rise in diversity.For example, the earliest known bat dates from about 50 million years ago, only 16 million years after the extinction of the dinosaurs.
Mammals took over the medium- to large-sized ecological niches in the Cenozoic, after the Cretaceous–Paleogene extinction event emptied ecological space once filled by non-avian dinosaurs and groups of reptiles that were now absent.Then mammals diversified very quickly; both birds and mammals show an exponential rise in diversity.For example, the earliest known bat dates from about 50 million years ago, only 16 million years after the extinction of the dinosaurs.
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