The first 2 are specific to 'wild' or feral chickens.
The last 2, more the history of the chicken as a domesticated bird.
http://www.backyardchickens.com/t/407821/is-there-such-a-thing-as-wild-chickens
http://www.wickedlocal.com/article/20100107/News/301079192
http://www.smithsonianmag.com/history/how-the-chicken-conquered-the-world-87583657/?no-ist
https://en.wikipedia.org/wiki/Chicken
The last 2, more the history of the chicken as a domesticated bird.
http://www.backyardchickens.com/t/407821/is-there-such-a-thing-as-wild-chickens
http://www.wickedlocal.com/article/20100107/News/301079192
http://www.smithsonianmag.com/history/how-the-chicken-conquered-the-world-87583657/?no-ist
https://en.wikipedia.org/wiki/Chicken