My neighbors chicken had chicks at our place and he said they were Black Australorps. We just got our first chicks and we have 1 one that is not like the others and looking at the website it is a Silver Ameraucana. How did this happen? The hen hatched two and a week later two others attempted to hatch and she wasn't sitting on them so I took them in (the Silver and a Australorp). Any suggestions? They are a week and a half now.