I have 2 just under 3 week Rhode Island red chicks. I feel like the 1st one is a hen 2nd picture ?rooster? (The 3rd picture is the same chick from the second picture, just a full body shot). I know it's hard to tell from a young age but I'm seeing such a distinct difference in the combs of them both. Is this just an RIR thing? And they are maybe both hens? This is my first time rasing from chicks, Thanks