There's a crow that sits on top of our fence and yells at my cat. The cat is of no threat to the crow. Not speaking crow, I'm not sure if the yelling is angry or just talking loudly. There's no flapping of wings or extending to look big. He just stands there a very obviously crowing at the cat. The cat in no way feels threatened and just lays there. Not sure if his inner monologue is "ugh, this guy" or not, but that's what it looks like.