Imagine a world, violent to newcomers, bloody and sometimes deadly, where the males are essentially warlords who each demand many females. Inhabitants will turn on each other and sometimes kill their own. Welcome to the vicious, unforgiving world of chickens.
References: http://nwedible.com/you-absolutely-should-not-get-backyard-chickens/ https://www.backyardchickens.com/threads/will-chickens-kill-each-other.256298/ https://www.thehappychickencoop.com/how-to-introduce-new-chickens-to-your-existing-flock/ https://www.thespruce.com/do-hens-lay-eggs-without-rooster-3016749 https://www.thehappychickencoop.com/why-you-should-not-get-chickens/