Why are these Buff Orps so different in size ?

[ging3rhoffman]

These Buff Orpingtons are the same age. They are 7 weeks old. The one already has wattles and comb and is much larger.

The larger one is the picture that you see above.

 

[briana1975]

I would guess the one is a roo.

 

[silkieluver_07]

The one is a male and the other is female. Males tend to be larger than females usually.

 

[Domestic_goddess]

You've got your self a roo.......that explains it! Cute Love buff orps.