Derek Abbott over at the University of Adelaide has constructed a chart of how different languages express the sounds that animals make. (You can find it here.) Japanese creatures seem an odd lot with bees going boon boon, cats meowing with a nyaa nyaa and purring goro goro, and ducks quacking ga ga. Thanks to SwissMiss for finding this one.
And then over at MilitantPlatypus was this involving revolver. The rotobull.