I have a particular fascination with the fact that the sounds animals make changes from one language to the next. I mean, I think a cat goes "meow" but the French say that a cat goes "miaou." In Korean a dog goes "mung-mung," and of course I have no idea why I think a rooster goes "cock-a-doodle-doo." That could possibly be the strangest one.
For more crazy animal sounds check this. And I can't leave out this guy, he makes great animal noises and funny faces too.