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The original was posted on /r/todayilearned by /u/theotherbogart on 2024-09-28 14:30:25+00:00.

Original Title: TIL: Dominant female cotton-top tamarin monkeys use pheromones to stop subordinate females from breeding. The pheremones suppress sexual behavior and delay puberty. In the event that more than one female in a group becomes pregnant, only one of the pregnancies will survive.