The 'chicks' are between 3-4 months old now and there are definitely two roosters in the bunch. They are the same two that I suspected that were a bit larger than the other four pullets. They're trying to crow now but haven't quite figured it out yet and it sounds like someone is in the backyard playing a kazoo. They haven't met with much success mounting the hens either.
I haven't named the young hens yet, but the cockerels have been dubbed Lurch and Herman (think Addams Family and the Munsters), because they're much taller and more long-legged than their little sisters.
Here are a couple of random shots of the roosters taken recently:
(LtoR) Lurch and Herman
Aren't they some handsome fellas?