A female may choose a male from several because ... Looks are certainly important for the peacock, with his absurdly bright, burdensome train that he shows off to attract a female.

The exaggerated tail of the (male) peacock compared to the shorter tail of the (female) peahen, indicates that males are under stronger sexual selection than females (Figure 1a). However ...

attract female mice and increase the male's chance of mating and producing offspring. In that way, mouse pheromones act much like a male peacock's tail to attract mates -- an idea depicted in this ...