I'm raising my first 9 chickens (Araucana-supposedly). They are now 8 weeks old and fully feathered. One of them is a bit larger than the others and I suspect that it may be a rooster. I have noticed that s/he cannot stand for long before he sinks down on his hocks to rest. S/he is able to walk around, feed, drink, etc but doesn't ever stand for long. When most of the others roost he just sinks into the bedding and usually a couple of the others join him. When he does walk he doesn't appear to limp at (just slowly sinks). Could this be a growth problem (his legs are bigger and longer looking than the others)? Or is it a disease (that can hopefully be treated)?