I had a chicken show up in my yard last January. Mine is a game hen. I have other chickens too, but this one prefers to be alone. She does not like being cooped up with them, so I let her be. She was roosting in a tree, then she started sleeping in the barn, and now, well she is hiding eggs somewhere, this is about the 3rd or 4th time she's gone broody, and this time I have not found her yet, although a couple times I have seen her running around the yard for a bit. She obviously ran away from a home that had other chickens and prefers to not be with other chickens. Every chicken has its own personality, and it may not always be easy to find it exactly the right companion. This chicken is free to leave any time it wants because I do not cage her, she got very upset when I have, and if she wanted friends she could either become friends with mine, or she could move to any of the houses on this road that have chickens.