Can Chicken's Change Their Gender?

Chicken keepers will tell you that it is fairly common when you keep a group of hens together without a Rooster that one strong hen will begin to act and produce hormones consistent with a rooster.  The hen will become dominant, stop laying eggs, her comb and waddles will grow, she will begin to crow and in some cases she will even mount the other hens. 

 Pictured above is Belladon, my friend's hen who looks and sounds like a rooster.

Belladon belongs to my friend.  She is a one year-old hen who has been kept with other pullets and hens.  Until a few months ago she looked like the other hens of her breed with a smaller comb and waddles.  As the transition happened she stopped laying eggs, started crowing, and even attempted to mount the other hens.  As her transition moved on, she was so convincing the other roosters started to attack her.  

Did Belladon change her gender?  Although there are physical changes that take place, all of her plumbing remains the same, and she has female sex organs and would not be able to fertilize the other hens.  There are many stories of hens transitioning to be more rooster-like and I will include some links at the end of this post.  Science believes the hormones the hens produce change to make the physical changes in their bodies.  In Belladon's case, she is currently being kept away from the other chickens for her safety and my friend plans to build her and another hen a small run where Belladon can live in safety from the roosters.  As my friend stated, we accept Belladon just the way she is. 

 (links to other gender changing chicken stories below)

http://scoopfromthecoop.nutrenaworld.com/tag/can-my-hen-become-a-rooster/

http://www.livescience.com/13514-sex-change-chicken-gertie-hen-bertie-cockerel.html 

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In the spirit of experimenting - I am experimenting with re-running an article I have already posted before.