Handbook of Birds of Eastern North America

The book that made American bird-watching possible in the field: keys, plumages, songs and habits for every species of the East, by the man who ran ornithology at the American Museum.

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Remarks (Forward extension)

The forward extension of the feathers on the culmen will GEESE. always distinguish this species from O. americana, while it may be known from deglandi by the absence of white in the wings.

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