Don't know if you have them in your area, but Great Horned owls will take a hawk, even a large one. And the smaller ones will take smaller hawks and falcons. The hawks are at their worst when the owls are at their best, vision wise, and since they frequently compete for the same prey, the owls seem to go out of their way to kill hawks in their territory. Power lines are the other big killers of raptors of all types, most overhead lines are uninsulated, and several have wing spans sufficient to touch line to line. Feathers are a pretty good insulator, but only if their dry. Later.
Dave