Scientists Unsure Why Female Flies Expel Sperm and Eat It

This month has accidentally taken on a theme of “animals putting things outside their bodies that we think should stay inside” (starfish tags, sea squirt stomachs). So this post, which first appeared in April 2013, seemed like the right one to wrap up with.

She’s apparently a picky mater but not a picky eater. The female of a certain fly species, after mating with a male, dumps his ejaculate back out of her body and onto the ground. Then she gobbles it up. Despite new hints that this beha

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