Last night I lost a hen and four of her chicks ,two are left. They are about three weeks old. They haven't been in the coop before as I couldn't catch them. I have caught the last two and have them in a carrier in the coop. I have a small coop not really big enough to section off an area but they are to small to join the flock aren't they? What should I do next? Thanks in advance for any help!