The one-in-10,000 sex-swap has taken about two years and started when Georgina shared a home with other hens.
'As she was surrounded by other hens with only one other male in the group she has decided to take on the role of a cockerel,' said Jane Howorth, who keeps George at the Battery Hen Welfare Trust headquarters in Chulmleigh, north Devon.
George has even developed a cockscomb on his head.
The change is believed to happen when a damaged ovary causes the hen's testosterone levels to soar, turning the remaining ovary into a testicle.
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