"Brown" Blackcap

On 3 September 2004, Ulbe Rijpma, Henk Luten en Wijnand Bleumink trapped an aberrantly coloured Blackcap. This mutation is known as "brown".
More about this subject can be found in the article by Hein van Grouw: "Not every white bird is an albino" (Dutch Birding 28 (2): 79-89, 2006)

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