JEFF LEPORE / SCIENCE PHOTO LIBRARY JEFF LEPORE / SCIENCE PHOTO LIBRARY
Grey wolf. Head of a snarling grey wolf (Canis lupus). This is a sign of aggression, and is used as a threat between wolves. Grey wolves live in packs of between 5 and 15 individuals. Packs are led by a dominant pair. As a pack, they prey on large herbivores such as elk, deer, bison and mountain sheep. A wolf could not catch such large prey alone. Grey wolves are found mainly in northern North America and Asia. They may take domesticated animals, which has led to their persecution in many areas. They are coursers, running for long distances while hunting, and a pack may cover up to 60 kilometres in a day. Photographed in Montana, USA.
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