A Synopsis of the Birds of North America

by John James Audubon

447. 7. Larus eburneus, Gmel. Ivory Gull.

Plate CCLXXXVII.

Bill moderately stout, yellow, feet black; wings an inch and a half longer than the tail; plumage pure white. After the second moult, the bill dusky for two-thirds, yellow at the end, feet black; plumage white, the forehead and sides of the head mottled with leaden-grey, most of the wing-coverts with, a greyish-black spot towards the end; the quills, large coverts, and tail-feathers similarly marked, the markings on the tail forming a subterminal bar.

Adult, 19, 41.

Accidental on the coast of the United States. Common in winter in Labrador and Newfoundland. Breeds in high latitudes.

Larus eburneus, Bonap. Syn. p. 360.

Larus eburneus, Ivory Gull, Swains. & Rich. F. Bor. Amer.

Ivory Gull, Nutt. Man. v. ii. p. 301.

Ivory Gull, Larus eburneus, Aud. Orn. Biog. v. iii. p. 571.

448. 8. Larus zonorhynchus, Richardson. Ring-billed Gull.—Common American Gull.

Plate CCXII. Adult and Young.