Why does one of my Australorp pullets have a green hue and the others do not?

[Blueeyez]

I've noticed that one of my 4 Australorps has developed a beautiful green sheen on her feathers that is very noticeable in the sun, but the other 3 don't even have a hint of it? They are all about 7-8 weeks old, all pullets (I think.... Lol). So I'm just curious why this one particular bird would have this different coloring? Thanks

 

[EggSighted4Life]

Could be a cockerel. But comb and waddles would likely be a dead give away at this age.

Most black birds do have beautiful green shine to them. Some will even look purple or blue! Chances are they are just developing at slightly different rates, as mine ALWAYS do. But there are always some slight differences even from the same parent stock.

Feel free to post pics!