Leucistic Adult Large Cactus-Finch (Geospiza conirostris) on Espaola Island, Galpagos: A Potential Continuation of Nestling Beak Color
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We present the first detailed report of an apparently leucistic Darwin's Finch, observed on Punta Cevallos, Espaola Island, Galpagos (01 23.61S, 89 37.11W). We suggest that the unusual adult phenotype is a continuation of nestling beak color, which is usually masked by melanin in adults. Tissue-specific differences in beta-carotene dioxygenase 2 enzyme activity may explain the variation in yellow pigmentation in this individual's legs and beak. 2013 by the Wilson Ornithological Society.