Biologists have found that courting male black widow spiders shake their abdomens to produce carefully pitched vibrations and avoid potential attacks by females -- who otherwise may misinterpret the advances as the vibrations of prey.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/8...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/8...