JOHN GREIM / SCIENCE PHOTO LIBRARY JOHN GREIM / SCIENCE PHOTO LIBRARY
Brown bear (Ursus arctos) scratching its back against a tree. Brown bears, or grizzly bears, are mainly solitary animals, foraging in mountains and river valleys in Eurasia and north-western North America. They can reach 2-3 metres tall and weigh over 700 kilograms. They are mainly vegetarian and feed on a wide variety of plants, but they will also eat meat when available, both by hunting and by scavenging for carrion. Photographed at Great Adventure Safari, New Jersey, USA.
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