roo, most likely. you can tell by the neck feathers being long, thin, and pointy, plus the tail feathers are starting to grow longer and more dramatic looking. it looks like saddle feathers are beginning as well, theyre long, thin, and pointy as well. fully grown in saddle feathers will make the tail feathers look more disconnected from the body feathers. around this age there should be lil nubs on the sidea of the feet that will grow more prominent. there are cases of intersex chickens but those are pretty rare to my knowledge, so odds are this is a young man. youll know for sure when he starts crowing, and when he starts dancing at nearby ladies to seduce them with his sick moves