This is my first and only black australorp... it is 5 weeks and two days old... it was the slowest to feather and is pretty spunky. It's legs are no thicker than my other chicks and it's comb and wattles are no different also... it always stands tall, but will stand at rest like a pullet...my gut says it's a pullet based on what I've read on this forum stating cockerels tend to be very developed by now... thought I'd involve my fellow chicken peeps and see your guys opinions. Then when I get an egg or crow I'll update. In the first picture the chick in question is on the far left