I have 4 chickens that arrived Wed. from MPC. They are supposed to be pullets, but i am very suspicious about my little RIR. She already has a little comb coming in! Its not very big, but noticeable compared to the other 3. Could this just be how the breed is? I know it's too early to tell, but "she" also acts a little differently. She is always the first to notice me, first to run over when i stick my hand in, and seems to get between me and the other chicks (she is especially protective over my little Delaware). She also has a long neck, but again maybe this is a RIR thing? So on to my question, i am thinking i should get another RIR chick in case this one is a Roo (as i can't have Roo's here). MPC will ships a minimum of 4, and we can't have 4 more, so that leaves me getting one from the Feed store. My concern is that bringing in another chick from a different place could bring in disease. Unfortunately i did not get my chicks vaccinated against Mareks. Opinions? Edited to add: I just noticed that my little RIR is starting to get tail feathers now! Wow, i can't believe how fast they get feathers, they are only 4 days old and 2 of them already have substantial wing feathers too!