Gertie still looks mostly like a hen. I've seen plenty of normal egg laying hens with as much comb and wattle, and her feathers still look very henish. Looking at the picture, I see a hen. If I saw her strutting and crowing and doing the rooster shuffle, I would be more able to see what the story is talking about.

It isn't at all uncommon for one of the hens in a roosterless flock to start acting like a rooster. Whether or not that's because of mycotoxins, I can't really say.

So anyhow, we humans can definitely do a better job of taking on the characteristics of other than our birth sex. The change to that chicken is nothing compared to what hormone therapy will do for us humans.

Oh yah... chickens don't have external genitalia. Nothing short of a necropsy is going to show if the chicken traded in her ovaries for testes. I very strongly doubt it, though.