When I bought this chick I was told it was 8 weeks which would now put it at 13 weeks. Due to the size I think it is more like 8 weeks now. Can any one tell me what it is? I did think Maran but it's started to grow a tuft on it's head. This pic was taken 2 weeks ago: and these pics were taken today: You can see the tuft has grown, any ideas?