Where I live in Florida I have bobcats, armadillos, coons,fox,coyotes,rats,snakes,birds of prey. I cover all my animals because all it would take is you run inside for the phone or get distracted and the results could be bad.
I never leave my Russian outside unattended if he isn't in an enclosure (he is 1yr old). Seagulls, Crows, Jackdaws are all big greedy birds and it's not worth taking the risk.