I've got a feeling that the instant you shoot it and prove it exists, it's going on the endangered species list, so I'd imagine you wouldn't want to shoot one. But then again, there are no regulations surrounding tag purchasing and the sort, and TO DATE it's not a protected species, nor known as a non-game species, so then again it might not be illegal. However, it is likely that it would qualify as a primate, all of which I believe are protected in the states at least, if not in their respective nations of origin.

However, if you can prove it is self defense, then you can kill about anything you want to, so I'd say watch it and enjoy being one of a million "bird brains" and "whackos" across the U.S. and only shoot should you be attacked.