I worked hard building a 12 foot elevated coop for my chicks and pullets, adjacent to the main chicken run, with a covered, secure tunnel to it. The tunnel didn't work out this year, because the adult hens (Amberlinks) in the main run are so aggressive towards the two month old pullets. (very different behavior from the Americana adult hens last year, which were accepting of the pullets). So I built a second ramp to the 12 foot coop, so the pullets could access the yard another way. All 30+ have no trouble going down the ramp and enjoying a day in the yard. But at nightime only about eight go back up the ramp. The others all situate themselves underneath the coop, and would be easy picking by predators. Every night after dark I have to go out and catch them all and put them into the coop, which gets old. Hoping they get a few more brain cells soon!