TOM MCHUGH / SCIENCE PHOTO LIBRARY TOM MCHUGH / SCIENCE PHOTO LIBRARY
Black rat (Rattus rattus) in an aggressive, threatening posture. This rodent is probably native to Asia, but it is now found throughout the world near human settlements. It is a social animal, forming clans of up to 60 individuals. The clan's feeding territory is fiercely defended against invading rats by biting, jumping, and standing on the hind legs and hitting with the front paws. The black rat is an omnivore, eating seeds, nuts, vegetables, fruits and insects, as well as materials such as soap, paper, hides and beeswax.
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