Greater Sand Plover with abnormal colouration
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"all 835 species of birds recorded on the continent, including 116 accidentals, this is the first field guide to North American birds specifically designed to satisfy the interests of the serious birder. Its three volumes contain, in all, 1245 full-color photographs, 193 paintings, 422 drawings, and 650 range maps, while 61 of the nation’s top field ornithologists and experts contribute their special knowledge to the 370,000 words of text. Entries are arranged taxonomically to the new American Ornithologist’s Union Classification"