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Behavioral sink

Behavioral sink is a term invented by ethologist John B. Calhoun to describe a purported collapse in behavior that can result from overpopulation. The term and concept derive from a series of overpopulation experiments Calhoun conducted on brown rats between 1958 and 1962. In the experiments, Calhoun and his researchers created a series of "rat utopias" – enclosed spaces where rats were given unlimited access to food and water, enabling unfettered population growth. Calhoun coined the term behavioral sink in a February 1, 1962, Scientific American article titled "Population Density and Social Pathology". He later performed similar experiments on mice from 1968 to 1972.

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