![]() In southern North America, small woodland foxes grew bigger and better adapted to running, and by the late Miocene the first of the genus Canis had arisen-the ancestors of coyotes, wolves and the domestic dog. In many areas, forests and savannahs were replaced with steppes or grasslands, and only those species of creature that adapted to these changes would survive. This would lead to the glaciations of the Pliocene and the Pleistocene, which are commonly referred to as the Ice Age. ![]() Six million years ago, towards the close of the Miocene era, the earth's climate gradually cooled.
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