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Keywords from Image Description:
Rock Ptarmigan. . Male in Winter plumage. . Female Summer plumage. . Young in August NYPL b. en Lagopus rupestris nypl org Scan by NYPL Rock Ptarmigan Male in Winter plumage Female Summer plumage Young in August Audubon Chevalier General Research Division cdacfffdabc The birds of America from drawings made in the United States