I have around 5 to 8 chicks out of 12 eggs with a broody hen. Some of the chicks hatched out on day 20 and some of them have hatched out on 21 day, with more to come, I hope. When I checked on them, 4 of the chicks had gone walking and couldn't get back to their broody hen because the nesting box was too high, (I've now build up a ramp for them). One of the chicks out of the 4 that when walking, was laying on it's back stretched out, I've put it back under the broody hen. When I put the chick back under the broody hen, I noticed that one of the chicks legs has a different color in part of it's leg. Is this Normal ?