My chicks are a week old today (at least the first ones that hatched are). They were born and have been in here all week. Today I let them run around outside the cage with mom. Mom seemed to enjoy the extra space to scrach around. My question is at what age can I open the floor door and allow mom and the kids to go downstairs to get some air. Also, at what age can I let them out to roam around the garden or the yard? The other hens can be left in when I want to let the mom and chicks out. Here is what the coop they are in looks like so you can get a picture. The only difference is that window is now a door. With 3 hens sitting I couldn't get in the other way .