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Why birds don't have penises and how it could offer clues to help understand ...
Daily Mail
It has been an evolutionary puzzle which has long baffled scientists - why have penises simply vanished from the vast majority of birds? While ducks and geese are known for having extra-long penises, males in 97 per cent of species of birds reproduce ...
Study reveals how birds lost their penisesBBC News
Scientists Identify Protein That Stops Most Birds From Having PenisesCinema Blend
Birds and the size of genitaliaGuardian Express
Los Angeles Times -Headlines & Global News -Nature.com
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