Why is this thread useless again? At least were actually talking about it in a non-spam way. The posts saying "this should be locked" are more spam than this topic. If it's spam, report it and have mods deal with this stuff.
On-topic now. Don't they do it for mating calls to?
You know, if you had enough knowledge, you could actually discuss the nuances of a cow's moo and motivations for mooing quite easily. Unfortunately it seems nobody has quite been able to do so on a sustained basis here.
So I'll lock the thread, but for future consideration: think of the difference between our language, which is full of statements, structure, propositions... and that of most animals, which is more forms of declaration, and then think of what each conveys, and how each are responded to. Dunno if that'll help.