I raised them in the same brooder with my chicks and they all get along just fine. It is possible and I would be surprised if there were more keets in the springI raised mine from keets too! They are a lot of fun to watch but also are the most aggressive towards newcomers. Aka new chickens. I am nervous this year as they should start laying. I'm told that's when they take off sometimes. Perhaps yours are in the woods on a nest somewhere rancher?
