Potoooooooo
June 9, 2008, 11:03 PM
http://news.nationalgeographic.com/news/2008/06/080609-barn-swallows.html
Male barn swallows whose breasts were artificially colored red were coveted by females and spurned by males, responses that changed their bodies' chemistry, a new study found.
Male barn swallows whose breasts were artificially colored red were coveted by females and spurned by males, responses that changed their bodies' chemistry, a new study found.