A rã arborícola Agalychnis callidryas

A study from Caldwell and colleagues published online ahead of print demonstrates for the first time that an arboreal vertebrate—the red-eyed treefrog Agalychnis callidryas—uses plant-borne vibrations for agonistic communication. This infrared video first shows a close-up of a male's aggressive tremulation display and then shows a contest between two males: the male that begins at the lower right of the frame behaves aggressively, tremulating several times before his opponent retreats.