any of various northern alcidine shorebirds (esp. genus Fratercula) black above and white below, with a short neck, ducklike body, and a large, brightly colored, triangular beak
See puffin in American Heritage Dictionary 4
(pŭfˈĭn)
noun
Any of several sea birds of the genera Fratercula and Lunda of northern regions, characteristically having black and white plumage and a vertically flattened, triangular bill that is brightly colored during breeding season.