Evolution: Ostrich penis; odd convergence (Introduction)

by David Turell @, Tuesday, December 13, 2011, 20:56 (4730 days ago) @ David Turell

Some birds have a penis and it becomes erect, but it ues a lymphatic system of enlargement, while mammals use blood:

http://www.scientificamerican.com/article.cfm?id=ostrich-penis-clears-evolutionary-myst...


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