We recently made a run to attach to an existing coop for a flock of 4 adult hens. The smaller triangular shape one is for momma and her 4 chicks. I do NOT recommend this A-frame to anyone, it is so hard to open and close and it's SMALL! I purchased it off Craigslist in a bind and it is working for the chicks for now. Hopefully they can be mixed in with the existing flocks as they get older, they are 3 weeks old now.