I have 7 chicks, 2 silver laced wyandottes, 1 gold laced wyandotte, 2 buff orps and 2 black autralorps. All chickens are active and appear healthy. They are about 10 days old. The posture of the wyandottes is beginning to concern me. While the buffs and the aussies strut around all proud and with their necks extended often, all three wyandottes seem to pull their heads in toward their bodies more, and look almost short-necked. Their chests have more of a crease down the center than the other chicks do. If this is normal and they just have different shapes, please let me know to alleviate my concern. The only recent change to their environment is that I switched to shavings, which I have not seen them eat a lot of. They are on chick starter only, no treats, no grit. They eat the occasional bug who is suicidal enough to fly in. Thanks! Edited for abysmal spelling.