I heard the crow's Asshole Alert System activate, but couldn't see what they were upset about. by the sound I would guess a coyote, though I didn't see one, which isn't too surprising since they were a little ways away through the forest. I can just about tell the difference between the "ground asshole" and "flying asshole" calls. XD
to be fair, there's also a change in their behavior when dealing with different assholes, so that's kind of a cheat. but their scolding also *sounds* different, and when you can't see their behavior that can help identify what to look for.