For these three weeks of sexual kamikaze, antechinus males are concerned with nothing–absolutely nothing–other than mating with as many females as they possibly can. Ecologist Andrew Baker of Australia’s Queensland University of Technology, who studies these critters’ astonishing habits, has even picked up a copulating pair, who ignored him entirely and went about their business in his hands. “It’s pretty frenzied,” said Baker. “There’s no courtship or anything like that. The males basically just grab the females and go for it.”

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