. Bulletin of the British Ornithologists' Club. Birds. Jose Cabot & Tjitte de Vries male 279 Hull. 2004 124(4) t female. $mt l°year 3° year 5° 6° Figure 1. Dark-phase plumage patterns in B. polyosoma according to age and sex. Numbers correspond to calendar Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Ornithologists' Club. London : The Club

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1893