Unilateral pentadactyly and its surgical resolution are described in a 75-day-old female yellow-shouldered Amazon (Amazona barbadensis). The bird had a malformed left pes, whereas the axial skeleton and the thoracic and pelvic limbs skeleton were normal radiographically and clinically, excluding the left pes. The only clinical sign observed was lameness. The male clutchmates were normal on orthopedic examination. The affected bird underwent surgery successfully for removal of the supernumerary digit. The bird exhibited some distress after the amputation of the extra digit, but 3 months later, was perching and behaving normally. Treatment is recommended as soon as possible after presentation, preferably before the bird begins perching. The recommendation is made that birds with unilateral or bilateral polydactyly not be used for breeding, because this condition may have a genetic component.