Leucistic Stonechat as pitfall of Desert Wheatear

On 5.12.2012 a believed-to-be Desert Wheatear Oenanthe deserti was found at Gola de Puçol, near Marjal dels Moros, Valencia. The bird had an obvious all black tail and showed a proper combination of whitish underparts and mantle combined with brown cap, blackish face and bib plus slender black bill. Some pictures were taken and a report was sent to Spanish Rarities Committe (CR-SEO/BirdLife). When seen the (distant) images, it was quickly felt that something was wrong with the expected Wheatear shape, particularly in terms of proportions. After acknowledging the authors and telling them that we were thinking in an aberrant (probably leucistic) Stonechat (Saxicola rubicola) rather than a Desert Wheatear, an alert was sent to local birdwatchers.

On 6.12.2012 Miguel Tirado and others went to the site of the observation only to confirm the initial suspicions: the bird was indeed an amazing lecistic Stonechat, which almost matched the colour pattern of Desert Wheatear!.

Unlike 5.12, on the 6th of December a good closer photo was taken and the proper identification was clear. Note the characteristics of the bird compared with two images of a 'real' Desert Wheatear from November 2011 at Asturias. And the question is that, regardless colours, time of the year and place, structure is very important when facing a bird identification particularly if keeping in mind the possibility of plumage aberrations as this case clearly demonstrates.


© Miguel Tirado, 6.12.2012
© Javier Portillo 14.11.2011

© Javier Portillo 14.11.2011

Resumen. Tarabilla leucística confundida con collalba desértica. El  5.12.2012 lo que se pensaba era una collalba desértica fue observada en la costa del Marjal dels Moros, Valencia. La estructura observable en las fotos lejanas del ave del día 5.12 no era la de una collalba y sugería una tarabilla con alguna aberración cromática. El día 6.12.2012 fue relocalizada el ave y observada pertinentemente lo que llevó a la conclusión apuntada el día anterior de que en vez de una rareza era una especie común con una aberración cromática rara. Esta variación del plumaje podía inducir a confusión con la collalba propuesta en observaciones lejanas. Aunque la estructura de las especies es diferente, el no tener en cuenta la posibilidad de aberraciones cromáticas en especies frecuentes puede llevar a confusión ante la cita de una especie rara en lugar y épocas teóricamente adecuadas.

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