Resumen de Bill abnormalities in a pair of Black Wheatears (Oenanthe leucura)

Guillermo Blanco Hervás, José Luis Tella Escobedo

• Both members of o pair of Black Wheatears captured in central Spain showed an appreciable elongation of both mandibles. The male had an extraordinary elongation and curvature of its upper mandible, which later broke and took on the normal form