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Age of Mammals


Age of Mammals

The Cenozoic Era, from 65 million years ago to today, is the age of mammals and flowering plants and is marked by global cooling. The extinction of the dinosaurs allowed mammals to diversify and grow in size during the Cenozoic. Early horses, such as this Mesohippus celer, stood about half a meter high at the shoulders. Horses gradually grew and adapted from expansive woodlands of the warm early Cenozoic to the extensive grasslands of the cooler later Cenozoic.


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