Scientists think they know why snakes get two penises and people only get one
Researchers may have figured out why different species develop different kinds of genitalia. In snakes and reptiles, the genitals grow to mimic leg buds — producing twin organs. In humans, the genitals grow to mimic a tail bud — so the penis ends up as a single structure.
Continue Reading http://www.washingtonpost.com
Join the Discussion