Hein van Grouw, Dirk Tolkmitt, Detlef Becker and Frank Weihe / October 2021 – vol. 114, issue 10, pp 629–637 Abstract Scattered records of birds with an unusual brown colour to parts of their plumage have been known for some time but, so far, the nature of this aberration has not been investigated. Aberrant reddish-brown phaeomelanin has been recorded in many species, including those whose plumage naturally contains only black eumelanin. The occurrence of a Eurasian Wryneck Jynx torquilla with ... This article is only available to registered users.To read more, please log in or purchase a subscription.