Researchers find female fish developed bigger brains after rape attempts

Despite what you might think, evolution rarely happens because something is good for a species. Instead, natural selection favours genetic variants that are good for the individuals that possess them. This leads to a much more complicated and messy world, with different selective forces pushing in many directions, even within a single species. A team of Swedish and Australian researchers led by Séverine Buechel from Stockholm Universitywondered if, like predator-prey conflict, sexual conflict might also affect the evolution of brain size. The team bred mosquitofish in a lab - both male and female.