MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Hesperocyon, illustration. This extinct prehistoric mammal lived from around 42 to 31 million years ago, during the Late Eocene and Early Oligocene. It was one of the earliest canids, with its dentition (teeth) showing it to be related to wolves, foxes and dogs. It reached a length of around 80 centimetres. Its fossils are found in North America.
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