Black Australorp or ... ?

[allieb8228]

So we have two week old Australorp pullets and one of them is quite a bit larger than the others. I'm wondering if this pullet is actually a rooster, if we have a different breed or if we just have a large Marge on our hands. What do you think??

First pic is the unknown chick, second pic shows s/he towering above the others

 

[BrambleFoxFarm]

Our first breed ever was Black Australorp and it became obvious rather quickly which one was the roo. He got bigger and way more upright. Also his comb was a lot deeper red and larger faster. Our Black Australorp roo was hands down the best chicken we ever had! Such a lover and a great personality...like a puppy dog!