Abstract
Rats housed alone or in pairs were tested daily with either the same partner or with a stranger. All rats were highly and increasingly attracted to each other, but they were not more attracted to familiar rats than to strangers. Isolated animals became more gregarious than pair-housed rats by the fourth day of testing. In Experiment 2, rats tested in trios with a stranger and a cagemate again showed no preference. The results indicate that rats do not develop specific attachments.
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