I'm surprised that she hasn't started squatting. She looks like she's ready to check out the nest box. My Tetra Tints are a few weeks younger, and there's no pink in the faces yet. They are small girls, the same size of the Blue Andalusians. Hopefully they lay large eggs, the Lois girls seem to be stuck at the pullet egg. You've got girls, if it were a boy at 15 weeks, the crowing would be most noticeable.
