Most freshly trapped wild birds never seem to need coping, and they don't usually get to feed on large boned animals and such. They gnaw on and feak on limbs and such for that purpose. I try to make natural perches for my hawks and for my falcons I have a large sand stone standing next to the bath pan. went for years without coping or the need for it, and one day built pole perches with artificial tops, and bingo, coping regular again. Going back completely with natural perches.