On a daily basis, I see mockingbirds chasing off crows. Sometimes they come out of a tree, so I assume those scenarios usually involve crows messing with nests.

On a daily basis, I see mockingbirds chasing off crows. Sometimes they come out of a tree, so I assume those scenarios usually involve crows messing with nests. Other times mockingbirds will chase off crows as they're apparently passing through. Never seen a crow fight back, and they fly away (sometimes not far) as if they're saying, Alright, alright, I'm going. Typically, it's just a single mockingbird, so it's not as though the crow is being overwhelmed, but, like the eagle in your example, it's probably just not worth the energy/potential injury. We have a lot of blue jays, too, and even though they're notoriously territorial, I can't remember seeing a blue jay/crow altercation. Maybe their reputation precedes them? I don't have any real guesses.