I KNOW this has been discussed but please help. I had 9 chicks killed by a predator, probably a dog. Reinforced the run and built a new coop. Got 10 more chicks. One was killed by a snake..the snake has been removed and every tiny hole in the coop closed. The chicls are approx 3 months old, are happy in the run all day. They huddle together at night but refuse to go into the coop. I pick them up and put them in. Now my 3 adult hens are going to sleep on top of THEIR coop (separate from the chicks. ). They had been going inside for weeks. I've cleaned the coops, put in night lights to guide them in, put food and water inside. This is driving me crazy! They hang out in the coops during the day, just not at bed time.