I have a small flock of mostly 15 week old chickens. When they moved outside they spend a solid day in their coop... But alas, only two silkies and two 7 week old babies go into their coop at night! The rest all try to roost on top! Is there any hope that they will eventually go inside on their own or am I doomed to have to snatch them one at a time and shove them in?