Only a few surviving small mammals continued to breed after dinosaurs became extinct about 65 million years ago, widely believed to be the devastating consequences of an asteroid impact on the Yucatan peninsula. The emergence of many new species has replaced the space once occupied by dinosaurs, some of which have become huge. In America, this large fauna includes giant sloths, camels and camels, as well as a variety of bison, elk, cattle, giant beavers, mammoths and mastodons. Before these herbivores came out, in the past 65 million years, there were some terrible predators on Earth, including the two-ton giant short-faced bear, a kind of lion, several kinds of saber-toothed tigers and giant dinosaur wolves. In Europe, there have been countless species of antler elephants, cave bears, giant Milu deer and so on. As for other continents, there are also spectacular hairy beasts.
passage?
The world inhabited by early human ancestors was dominated by large mammals