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Promiscuous salamander

A species of hybrid salamanders, all of which are female, have found a genetic formula for success - to mate with many males and use equal parts of each partner's genetic load in their offspring. The research reveals ways in which some animal species - all-female populations of fish, lizards and others - can use their genes to increase their chances of success. Photo: Robert Denton, Iowa State University

The promiscuous salamander: gives birth to offspring that carry genes from many males - from other species

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