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How birds lost their penises


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This is an embryonic chicken penis (pseudocolored red) viewed under a scanning electron microscope. Credit: C.L. Perriton and M.J. Cohn
In animals that reproduce by internal fertilization, as humans do, you'd think a penis would be an organ you couldn't really do without, evolutionarily speaking. Surprisingly, though, most birds do exactly that, and now researchers reporting in the Cell Press journal Current Biology on June 6 have figured out where, developmentally speaking, birds' penises have gone.

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In animals that reproduce by internal fertilization, as humans do, you'd think a penis would be an organ you couldn't really do without, evolutionarily speaking. Surprisingly, though, most birds do exactly that, and now researchers have figured out where, developmentally speaking, birds' penises have gone.ESyIrLqNkVs

 

Read the full article on ScienceDaily

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