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brown rat
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A brown rat with grayish-brown fur and a long tail is perched on a tree branch, facing to the right with its whiskers visible against a blurred green background. A Norway rat (Rattus norvegicus) with brownish fur, small ears, and a long tail stands on soil and twigs with green plants in the background. Rat anatomy Rummaging for grain A small white rat with red eyes stands on a reflective glass surface, facing forward with its tail extended behind it. A white pet rat with gray markings sits in the cupped hands of a person wearing a purple plaid shirt, outdoors near water on a sunny day.
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Pest or pet?
A brown rat (Rattus norvegicus) perched on a branch.
© Heiko Kiera/Shutterstock.com
A cosmopolitan rat
Brown rats (Rattus norvegicus) live virtually everywhere that human populations...
© Wildlifesnapper/Dreamstime.com
Rat anatomy
The skeleton and internal organs of a rat.
Encyclopædia Britannica, Inc.
Rummaging for grain
A brown, or Norway, rat (Rattus norvegicus).
John H. Gerard
Laboratory rat
Albino rats used in biomedical research are specially bred brown rats (Rattus...
© Maslov Dmitry/Shutterstock.com
A beloved pet
A pet rat, named Dumbo, sits in its owner's hands. It is a domesticated brown rat...
© Akifyeva Svetlana—iStock/Getty Images Plus
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