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Politics : Evolution -- Ignore unavailable to you. Want to Upgrade?

To: Greg or e who wrote (67822)	7/10/2015 7:26:14 AM
From: Solon	Read Replies (1) \| Respond to of 69300

Duck Penis Duck genitalia and mechanical barriers Credit: Patricia L. R. Brennan1,2,, Christopher J. Clark1,2 and Richard O. Prum Ducks copulate through rape. As a result, females have evolved mazelike vaginas, complete with dead-ends to prevent insemination. Male ducks have evolved one of the longest penises in relation to body-size of any vertebrate as well has having a penis that takes on a corkscrew shape to better navigate the female’s vagina. Even ducks need contraception to avoid unwanted pregnancies. Corkscrew mazes with dead-ends work pretty good but might be uncomfortable for humans...[*Solon]