We bought two chicks from the local feed store a couple weeks ago - one Ameraucana and one Australorp. The Australorp was always slightly smaller than the Ameraucana, but now, a couple weeks later, she doesn't seem to have grown much at all. I picked the biggest Ameraucana I could find, and now she's about twice the size of the Australorp. The Australorp appears to be feathering out a little faster than the Ameraucana, but the size differential is worrying to me. Do you think there's something wrong with her? Is there anything I should be doing?