Have I got a roo?

[Yardmom]

The bird is probably a mixed breed. The white color could be coming from one parent being a white rock. How much larger is this chick than the others?

 

[The Moonshiner]

Would you say leghorn?

No, nope nope nope

 

[HorseGirlAbby]

I was dubious when the seller said Plymouth Rock... Would you say leghorn?

Not leghorn either. Could be a mixed breed, could be something like a California white or Austrawhite.