Fiddler Crabs Exchange Sex for Survival

Posted On: November 15, 2009

In the world of fiddler crabs, the best form of protection for females is, apparently, having sex with the neighbors, according to an Australian study published Wednesday.

Researchers from The Australian National University in Canberra found male fiddler crabs will happily defend a nearby female against intruders — partly because the females will dole out sex in return.

Most of the time, female fiddler crabs are selective about their partners and choose to mate in the male’s burrow. But the researchers also found females mating on the surface — and 85 percent of the time the surface sex was with a neighbor.

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