by Hein van Grouw
Abstract The 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 aberrant plumage types are grouped, named by their pigment reductions (gene actions). Identifying colour mutations in the field can be extremely difficult but this paper should make it possible to name many mutations correctly.
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