Sheralyn Booker, of Bath Road, Kettering, said Foghorn, a Polish chamois breed of hen, may have escaped from her back garden anytime between Friday, February 5 and Tuesday, February 9.
Ms Booker had been away for the weekend and only noticed that the pet, one of five she keeps at her home, had gone missing when she returned on the Tuesday.
She has urged anyone who sees Foghorn, who has an unusual ‘pom-pom’ style of head feathers similar to Sesame Street’s Big Bird, to report the sighting to a local vet as soon as possible.
Ms Booker said: “Someone has maybe seen her and picked her up, who knows. Maybe they wouldn’t know what to do if they saw a hen wandering around.
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“I know it’s not your usual pet, but I just want her back.”
Foghorn is roughly the size of a pigeon, with light brown feathers ending in a white tip and a pom-pom-like head.
Ms Booker raised the hen from birth, having been given five eggs to incubate by a friend four years ago.
Foghorn hatched with splayed legs, which meant she should not walk properly for the first few weeks of her life.
If you see Foghorn, contact you local vet or call Ms Booker on 07809865468.