Thanks for the replies. I know the chick isn't pure bred and I know there were Araucanas running with the flock, so that could explain the green legs. The black speckling is less obvious now and the chestnut colouring increasing. I have a funny feeling that 'Stripey' is a hen
as it isn't as boisterous as the others and is showing very few signs of developing a comb. In fact, it's the fastest feathering of the 8 chicks that hatched at the same time. I'd love it to be a hen and lay blue eggs for me one day.
He/she/it does have normal legs but decided to get up and walk away just as I took the picture.