It is not Walkabout. (Collective sigh of relief heard.) Empirical test was to shut them in the run this morning and shortly after, a dark brown hen with a white spot behind her comb was happily wandering outside the fence. Phew. It is also not Anya and not the one attempting to morph into a featherless biped.
What is poignant for me is that after a week or two of lowered production, they laid 12 eggs yesterday morning. For the last time. And I don't even know which egg was hers.