We present the first detailed report of an apparently leucistic Darwin's Finch, observed on Punta Cevallos, Española Island, Galápagos (01° 23.61′ S, 89° 37.11′ W). 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.

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