A study conducted by the universities of Glasgow and Exeter have found that female guppies swim faster than male guppies due to their unwanted sexual advances. Female Trinidadian guppies were subjected to different levels of sexual harassment over a course of several months. The female guppies became faster after five months of swimming away from the males. In fact the way the females swam changed drastically. The female guppies that were exposed to a low amount of harassment from the males kept their pectoral fins extended when swimming while the females exposed to a higher amount of harassment did not. This proves that the individual fish will actually change their entire physiology of swimming to adapt in their environment. Male guppies
