WILLIAM ERVIN / SCIENCE PHOTO LIBRARY WILLIAM ERVIN / SCIENCE PHOTO LIBRARY
Grey wolf. View of a grey or timber wolf (Canis lupus) running in snow. The name timber wolf is applied to grey wolves from North American forests. A fully grown grey wolf weighs between 18-80 kg. It lives in packs of 5-15 invividuals and preys on large herbivores such as elk, deer, bison and mountain sheep. The grey wolf is found mainly in North America and in Asia, although there are residual populations in Mexico, Europe and Scandinavia. The grey wolf is an endangered species in all American states except in Alaska. Photographed in Idaho, USA.
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