Well, we keep chicks inside until 8 weeks for LF, 12 for the bantys. So the crows can't or won't bother them. Not sure what it is. But the crows HATE the hawks more than I do, so they scream bloody murder at them. The crows also hate the evil jays and beat the crap out of them, so they stay away. Thus, I spoil the crows to encourage them to hang out and stay here.
Non venomous snakes are removed from the chicken range if they get there and aren't eaten before we find them. I don't mind them.
Venomous snakes however. If I see one, they get a load of snake shot. But we have the wicked aggressive rattlers, not the ones who are more scared of you than you are of them. We apparently have timbers and copperheads apparently, but I never see them.