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June 10, 2013 12:19 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/NrLQ62y29gw/story01.htm
Duck penises: The sagacontinues
As we all know by now, ducks have penises. Rather epic penises, in fact. Chickens, though, are penis-less. In fact, most birds don't have them. In an important update in duck sex news, Ed Yong follows the work of several scientists who are trying to better understand how genitals evolve and why they differ so much between species and genuses.Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/NrLQ62y29gw/story01.htm
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