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 ...

Measuring no bigger than 0.2 inches (2.5 centimeters), the sparklemuffin peacock spider ... vibrations that the female can ...