making his colorful back end stand up big and bright. They are called peacock spiders because this technique is similar to ...

A female may choose a male from several ... But bigger is only better up to a point. If peacock trains become too big or too colorful over time, they may no longer confer a selective advantage.

We studied the jumping abilities of miniature male and female Australian peacock spiders ... waving their third pair of legs and opening the colorful flap-like extensions on the abdomen.