Ours nest in the bushes(they really like the large amounts of milkweed that have popped up this year) and in the coop, but they always come home at night. Our house chicken has her own tiny a-frame nesting box next to the front door that she turns up in every night at about 7-7:30. But I used to have a friend who had bantams who would nest in her trees. I don't think it's that odd of them. I'd like to think that because wild turkeys roost in trees it might just be a natural instinct for most poultry/birds, but I don't really know.