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I thought this was a nice Halloween story for Biology. 
http://news.nationalgeographic.com/...-evolution-halloween-missions.html?source=rssVampire Moth Discovered -- Evolution at Work
A previously unknown population of vampire moths has been found in Siberia. And in a twist worthy of a Halloween horror movie, entomologists say the bloodsuckers may have evolved from a purely fruit-eating species... [video]