ivory gull(n = noun.animal) pagophila eburnea - white Arctic gull; migrates as far south as England and New Brunswick;
is a kind of gull, sea gull, seagull
is a member of genus pagophila, pagophila

black-backed gull, great black-backed gull, gull, herring gull, ivory, ivory black, ivory carving, ivory coast, ivory coast franc, ivory nut, ivory palm, ivory plant, ivory tower, ivory tree, laughing gull, mew gull, pewit gull, sea gull, vegetable ivory