I'm sure IB is right regarding our birds losing their natural self preservation abilities, my birds have been on open loft for over 20yrs. and my losses are the lowest they have ever been, had a male Gos had 4 in 9 days early in the year, had to show him the red card, seen my birds regularly outwit percy including a pair of 2nd. round youngsters that were up on their own having fun when percy arrived, they did the y/bird dink and shot off in different directions percy went on his way never attempted to chase, the pair quickly grouped and flew on for more than an hour, I'd never shut mine up over Winter I'm sure they would come out unfit and easy takings