. "1995-09-07Z"^^ . . "1917-05-11Z"^^ . "1917Z"^^ . "John B. Calhoun (May 11, 1917 \u2013 September 7, 1995) was an American ethologist and behavioral researcher noted for his studies of population density and its effects on behavior. He claimed that the bleak effects of overpopulation on rodents were a grim model for the future of the human race."@en . . . "Calhoun, John B."@en . . "John B. Calhoun"@en . "American ethologist" . "1995Z"^^ . . .