I got these chicks one week and 2 days ago. I believe they are about 2 weeks old. When I got them they were all the same as far as growth goes. Now it is very noticeable that one of them isn't developing at the same rate as the other two in the feather department. The wings and tail are most noticeable. This makes me think this one is a cock. What do you guys think? Is this guy a cock or a hen.