I think it's a.....?

[samcole]

I got some day old chicks, possibly mix breeds almost 3 weeks ago. They were all the same size...now I have one super chicken. Anyone have an idea what it might be? It is stretching it's neck out a bit in the picture. The grey one next to it is the same age.

 

[oldhenlikesdogs]

Could be the smaller are bantams and the big one is standard size.

 

[samcole]

Could be the smaller are bantams and the big one is standard size.

None of them were supposed to be bantams. All of the others are the same size, save for one little fuzzy black one.

 

[BantamLover21]

Looks like a possible White Jersey Giant to me. Or a mix.

 

[drumstick diva]

x 2