Biology and Behavior
The brown rat is nocturnal and is a good swimmer, both on the surface and underwater, but unlike the related black rat (Rattus rattus), they are poor climbers. Brown rats dig well, and often excavate extensive burrow systems. A 2007 study found brown rats to possess metacognition, a mental ability previously only found in humans and some primates, but further analysis suggested they may have been following simple operant conditioning principles.
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