I raised Broad Breasted Bronze turkeys for a few years. They were 100% free range after they outgrew the brooder. Never lost one to rain. (Surprisingly enough, no predators, either)When I was a child a farm across the street raised turkeys which they keep in the barn as chicks and juveniles because they said they unlike chickens, geese and ducks would die in the rain. So if it isn't true as an old wife's tale has been around for a looooong time.