User blog comment:Detectivekenny/I'm Back/@comment-1917865-20110619152353/@comment-1917865-20110619193224

I think the only obstacle with onomatopoeia would be (like you said) geographic/fauna differences. But as long as you stick with what's common in your main language groups, I think it'll be fine (e.g. rooster cluck, wolf howl, cricket chirp, owl hoot, etc.)