And here's more information about that story:
http://anomalyinfo.com/Stories/2010-april-22-giannis-new-life
"Gianni the chicken, you see, started out as
female"
"Much to the surprise of the hen's owners, Gianni started to crow at dawn, while still laying eggs and sitting on them, as the chicken developed male plummage, comb, and wattle."
So the one at the beginning of this thread, and the one in that article, are both cases of actual females that grew male-type feathers, so they looked like males (but they were able to lay eggs because they were really females.)