Bobbing. To deflect attacks and enhance escape, long-legged species – commonly known as daddy long-legs – from the Eupnoi suborder, use two mechanisms. One is bobbing, for which these particular individuals bounce their bodies.

Why do spiders bounce up and down?

Spiders determine how the silk vibrates using more prosaic methods. They create transverse waves by bouncing up and down on their web and longitudinal waves by plucking the strands of silk. ... Together, these techniques can help a spider pinpoint any damage to its webs—and any prey that might have become ensnared.

What is the purpose of daddy long legs?

They are an important source of food for creatures that eat insects, including birds and spiders, says ecology professor Guy Poppy, from the University of Southampton. "Insect eaters will be feasting on all the daddy longlegs at this time of year, a spider web will be full of them."