A couple years back I watched a crow relentlessly dive-bomb a hawk. He (?) missed the hawk the first few times, but finally connected and some feathers flew. The hilarious part was the crow screaming “Ca-caw Ca-caw Ca-caw” after its successful aerial attack. If the crow had a nose, it would have been thumbing it at the loser hawk.
Instaology 
I have read that crows are quite intelligent and aggressive birds. Your photos bear that out!
A couple years back I watched a crow relentlessly dive-bomb a hawk. He (?) missed the hawk the first few times, but finally connected and some feathers flew. The hilarious part was the crow screaming “Ca-caw Ca-caw Ca-caw” after its successful aerial attack. If the crow had a nose, it would have been thumbing it at the loser hawk.