Can anyone tell me why my young pullets (3 months old) won't sleep on roosts? They all try to pile up in one corner, with much squawking and complaining as they step on each other and fight over who gets to be the furthest in. Is this normal? I even tried leaving the heat lamp on for them, but it didn't seem to help. These girls also don't seem too eager to go outside in the daylight either. When they do, they're real jumpy and when one jumps in the air they all run for the door back into the coop. Three of them are buff orpingtons, three EE's and 4 Dominiques. The coop is plenty large enough for them, clean ... i can't figure it out. My red sex link hens are much calmer, and they were in the same coop until they were about 4 months old. Any thoughts?