I have a Rhode Island Red that I think may be a roo- he/she is getting colored (green) tail feathers and is a good 2 inches taller and larger than my others (Isa Browns). Very red comb and wattles are getting larger more quickly than my others. He/she has not started crowing yet.....they are all 13 weeks old, but this one seems to be a bit of a bully to the others....jumps at them, not on top of them. They were all supposed to be pullets....could this be a roo??