Here’s another advantage of having a big brain: you know how to choose the hottest mates. As it turns out, female guppies with bigger brains are smart enough to prefer attractive male guppies. Their ...

Best girlfriends might never let a man come between them — unless they're Trinidadian guppies. Among these fish, the presence of a harassing male can disrupt female social networks, causing ...

‘If you are surrounded by ugly friends, you look better’ London: When it comes to mating, guppies treasure their ugly friends — because they look so good by comparison. An article published on ...