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Female Ducks’ Twisty Tracts Defend Against Screwy Males

December 23rd, 2009 12:00 admin Leave a comment Go to comments

Male Muskovy ducks have impressively long, screw-shaped penises that move rather quickly, as can be seen in scientists’ high-speed video. Now it appears females may have evolved oddly shaped, curved vaginal tracts to defend against unwanted males.

Source: Female Ducks’ Twisty Tracts Defend Against Screwy Males

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