Rode Island red gender question.

[Colecgg]

I have 7 RIR chickens, all bought as female, they are now at a little over 4 months old and theres one chicken who has a big red comb and a red face, and always seems to be doing these small crows just short loud craaaaaw, not a cock a doodle do but he/she seems to be louder than the rest, il have a video of him doing it. I dont know if she is just the most mature or if its a rooster. Heres a link the the video

and pictures below of course. All the others have much smaller combs, another is a little big but not like this one, the others are much smaller and not a bright.

 

[sourland]

You have a red sex link pullet, and she is just maturing more rapidly than her flock mates. She will most likely be the first to lay.

 

[13 chickens]

 

[K Spot]

You have a red sex link pullet, and she is just maturing more rapidly than her flock mates. She will most likely be the first to lay.

x2

 

[WalkingOnSunshine]

Yep, RSL, not Rhode Island Red. And ready to lay. X3