New mechanism of vocalization in a fish species. Danionella is able to produce 140 dB sounds using a nice structure made of cartilages drumming on the swim bladder. This is very different from the typical direct vibration induced by sonic muscles observed in most vocal fish species. Don't miss the nice illustrative videos.
For your Friday afternoon enjoyment, this behind-the-scenes clip from The Nature of Things miniseries "The Secret World of Sound" features a selection of the surprisingly delightful songs of treehoppers, who vibrate their back ends against plant stems to communicate with each other: http://www.cbc.ca/player/play/2303353411916