Transgender Hens?

We have 4 hens, but about a month ago I heard a poor excuse for a crow coming from the coop. Is there a 5th bird, a rooster that I missed somehow? Was I dreaming this?

No, its just one of my very male-like hens trying to...umm...be more male?

Here is the situation: Switters and Omelet both look more rooster-like (larger/very red comb and waddle, longer neck/tail feathers), while Gloria and Buffy definitely look hens.  While Switters is just territorial like a rooster, Omelet now vocalizes her roo-ness every morning at 7 am, for about 20 minutes.

I've read that if you don't have a rooster, one of your hens will become more dominant and rooster-like.  This only makes sense, as chickens have a complex social structure, with the rooster playing a dominant role for the flock.  So it seems only natural that if you do not have a true rooster, that the hens will do their part and fill in the void.  Also, "gender" does not mean strictly male or female characteristics, as many species (including humans) display a wide variety of gender traits and behaviors.

So what does a crowing hen sound like?  I found a video that provides a great example.  The crow is still almost as loud, but is no where near the full sound of a true rooster.

What are we going to do with our crowing hen? Our local laws allow us to keep one rooster, but they are still subject to noise ordinances. Since our neighbors don't mind, we've accepted our hen Omelet for who she is and she will remain in our flock despite the early morning wake up calls.

So what happens if you live in a city where only hens are legal (because roosters crow) and now your hens are crowing?  From what I've read it is not too common, so I don't see it being an issue for many city chicken keepers.  If it does happen to you, talk with your neighbors to find out if you need to find your hen a new home.