I'm starting to think my mystery might be solved on this Orpington. I'm thinking it may actually be an early blooming pullet. Her rump sure has gotten nice, & round.Still is looking like a pullet. Do you have updated pictures of this bird?
All pullets. The ones with black tails are Rhode Island reds and the ones with white tails are red sex links.
I'll take pictures tomorrow if I have time for it.