Our two Silkies are three months old and been with the old flock for the last month and a half, and are understandably, the bottom of the pecking order, but otherwise accepted and tolerated by our other five chickens. They have yet to figure out, they need to follow the rest of the flock into the coop at night. Every evening, we have to put them in. They follow the others out in the morning without issue. Today, it rained and they stayed under cover, but as soon as the others went to bed, they went outside to their usual corner of the run, in the pouring rain, and laid in the mud. What to do?