I have a 1 year old Buff Brahma that I noticed was in the nest a few hours ago. Well, when I went outside at dark to lock them in for the night she was still on the nest. When I touched her she puffed up a lot and squealed at me. Does this mean she is broody? Do they sit on the eggs all night?? Should I get her some fertile eggs? I've never had a broody hen! Is it typical for Brahmas to go broody? Thanks!