Dark eye-patch of Fulmar

M. Densley's paper on Ross's Gull Rhodostethia rosea (Brit. Birds 72:23-28) drew attention to the structure and possible function of dark, bristle-like feathers surrounding the eyes of that species in winter plumage. A close examination of the dark eye-patch of the Fulmar Fulmarus glacialis reveals a somewhat similar structure: each dark feather has the central rachis bar

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