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This page is out of date. Click here to visit our new site. Mammals could keep themselves warm. Perhaps that is why they survived the meteorite. They evolved quickly, filling most life-styles left empty by the dinosaurs.Most mammal families we know today had appeared by 50 million years ago. Whales spread in the oceans while hoofed plant-eating animals, the horse family, became common on land and evolved into giants. Meat-eating and flying mammals also appeared at this time. Useful LinksClick for Further information about Spread of mammals Other History of the Universe Pages News about History of the Universe |
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