Sounds like it could be the ramp it is pretty steep.
They are all fully feathered and have been for some time. I know the coop is not too small, and they have all died outside in the run. I think I will just keep them in the coop for awhile till they understand that is where they need to be...
I have lost 6, six or seven week old chicks this week. They are outside in a large coop and good sized run. The first three that died seemed to have been squished by the other chicks in the night, because they were outside in the run instead of in the coop under the heat lamp. So I started...