If there is one consistent thing with birds it is that, if they have caught something to eat, another bird will do its best to try and pinch it. It doesn’t seem to matter whether they second bird is bigger or smaller. They will try their luck. I have definitely seen the big birds taking on the smaller ones but more often it seems to be the smaller ones trying to annoy the big ones. It is a strange choice because I’ve never seen it be effective. An immature bald eagle had caught something up in Skagit and it was standing contemplating its meal. A short-eared owl decided it wanted the food instead so swooped repeatedly at the eagle. To be fair, the eagle couldn’t have looked less concerned if it tried. It watched the owls come in many times but never flinched. Eventually it took off and carried its snack somewhere else to eat in peace.