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Article
Hein van Grouw, Auteur ; Dirk Tolkmitt, Auteur ; Detlef Becker, Auteur ; Frank Weihe, AuteurScattered 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 s[...]
Article
Robert Prys-Jones, Auteur ; Hein van Grouw, Auteur ; Philip Schofield, AuteurTwo historical records of Downy Woodpecker Dryobates pubescens in Britain are described. These records have not been formally reassessed for more than a century. A review of the records based on the available evidence is presented, which conclud[...]
Article
Hein van Grouw, AuteurThe most common plumage abnormalities in birds involve some form of white feathering, ranging from birds with just a few white feathers to individuals that are completely white. The causes of aberrant white feathers are diverse and, in many case[...]
Article
Anil Mahabal, Auteur ; Hein van Grouw, Auteur ; Radheshyam Murlidhar Sharma, Auteur ; Sanjay Thakur, Auteur
Article
Hein van Grouw, AuteurHein van Grouw n the birding world, general confusion seems to exist about colour mutations in wild birds and the correct naming of these aberrations. Almost all whitish aberrations are called '(partial) albino'. However, most of these are not a[...]
Article
Robert L. Flood, Auteur ; Hein van Grouw, AuteurWe investigate records of three unfamiliar plumage types of the Fulmar Fulmarus glacialis in the North Atlantic: extra pale, extra dark and those with a dark distal tail-band.The possible explanations for each case are: I) aberrant or variant 'A[...]
Article
Hein van Grouw, AuteurThe naming of colour aberrations in birds still causes widespread difficulty and confusion. This paper introduces a uniform system of nomenclature and provides a simple identification key for the most common plumage aberrations. Six main aberran[...]
