Scientists get frog to shake his booty

Panamanian species gets jiggy with it to intimidate rivals.

One species of male frog shakes its booty big-time in aggressive showdowns, with the victor pulsating its rear for a longer time and with more gusto.
The shaking, which starts with the hind end and becomes a whole-body affair, sends vibrations along the red-eyed treefrog's plant perch until the shaking reaches the frog's opponent sitting on the branch — this process is called tremulation.
"In the case of red-eyed treefrogs, tremulation displays in which the frogs shake their entire bodies convey information about the status and aggressive intent of the signaler," said researcher Michael Caldwell of Boston University. "They also appear to carry information about the size of the signaler."