If you watch those little buggers dig, you will see that they can get out from under a fence. However, I have observed that it depends on the size of the bird. My Rhode Islands, for example, are big birds, and they dig long enough to get all the grass on the other side, and then give up. But...
I have found, through researching several, buying one, and building a run addition, that they often consider how many hens can roost wing-to-wing in the coop. That may be quite a few, but as far as run space in the coop, they are usually far less than adequate for the number stated.
I did the same thing with cats when I had my farm. I had 9 in the end. But, I love cats and they love me, so.... I get it wanting to do something for animals. Very cool story.
I am new as well. I have mine in a secured run with an elevated coop. I have consistently read recommendations of 10 - 20 sq ft per bird. I am at about 10 ft2 per bird now, and I can tell you they just look a little cramped to me. Even without your run, the space is 400 ft2, so about 26...
Funny because my girls love broccoli and will play keep away with it. Mealworms - they don't quite know what to do with them. I was just curious and tried a few things. They are 9 - 10 weeks now and still "chicken" when I go to the pen. Usually they fly up to the house, but eventually, one...
Mine are six weeks old I think, fully feathered, and they have been out in a covered run with a coop for about a week. Temps got down in the 20s and I closed the coop door when they went up at night and took the water in. They have plenty of hay and bedding in the coop. In the morning I let...
The first picture looks like a cockerel. With mine, all the pullets do the mock fighting, but they are just establishing the pecking order. The cockerel's saddle feathers are pointed like in that first picture.