my chickens have a chicken house with a fenced in area attached. in the fenced in area there are perches that they like to sit on. up till a few days ago, all the chickens slept in their house but then a few nights ago, on chicken decided to sleep outside instead. then the next night the rooster stayed out with her. then the night after that, there were 4 chickens and the rooster outside and now all but one are outside. i usually lock them in the house at night so that they won't make commotion when the sun starts rising untill i can get out there and so that they don't get eaten by some wild animal that could possibly get in there, so my question is: why did they just decide to sleep outside and should i put them in the house or should let them to continue sleeping outside?