The two are best friends and would never peck each other. They're thirteen weeks old. They live in an enclosure with six other, much smaller polish chicks (whom they bully just a bit lol). They're not completely bald, but their crests are thinning and looka little ragged. Could this be because they are maturing into hens or are they sick? I'm new to this whole chicken thing but I love my precious pets! Thank you!