Aberrant Plumages in Cooper’s Hawks
Documentamos dos tipos de plumajes melánicos aberrantes, pálido y oscuro, en tres individuos de Accipiter cooperii en estado silvestre. Capturamos y fotografiamos dos individuos de A. cooperii con plumaje pálido en Dakota del Norte y un individuo de la misma especie en Virginia. Este es el primer estudio de muda de un individuo de A. cooperii de un plumaje aberrante juvenil pálido a un segundo plumaje básico pálido. Además, una de las dos crías macho presenta un plumaje pálido como su madre, lo que sugiere que la aberración es heredable. También describimos el primer plumaje melánico oscuro para A. cooperii. [Traducción del equipo editorial]Resumen
Ventral views of Cooper's Hawks from left to right: (A) pale female transitioning into second basic plumage in North Dakota on 17 June 2009; (B) normal plumaged juvenile Cooper's Hawk captured in Rockingham County, Virginia, on 27 September 2014; and (C) dark juvenile captured in Rockingham County, Virginia, on 14 January 2013. Dorsal views of Cooper's Hawks from left to right: (D) juvenile pale female during initial capture in Veracruz, Mexico, on 23 October 2008 (photographed by Eduardo Martinez-Leyva); (E) normal plumaged juvenile Cooper's Hawk captured in Rockingham County, Virginia, on 27 September 2014; and (F) dark juvenile captured in Rockingham County, Virginia, on 14 January 2013. (G) Pale female Cooper's Hawk showing retained and emerging rectrices, captured near nest site in North Dakota on 23 July 2009. (H) Fledgling male Cooper's Hawk, progeny of the pale female, exhibiting aberrant pale plumage near nest site in North Dakota on 6 August 2009.
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