These nesters include species of albatrosses, petrels, skuas, gulls and terns. Many seabirds breed on the island, including Arctic terns and Arctic skuas. Other species killed by the baits include giant petrels, black ducks and skuas. Kleptoparasitism by skuas, particularly the great skua, occurs at breeding sites. Distinguishing this skua from the Northern Hemisphere Arctic, pomarine, and long-tailed skuas is relatively straightforward. The terns are small to medium-sized seabirds closely related to the gulls, skimmers and skuas. The area is home to huge colonies of gannets, puffins, skuas and other seabirds. Many snow petrels and south polar skuas also breed in this area. Off-course south polar skuas and snow petrels are occasionally seen there. Puffins, skuas, and kittiwakes nest on its sea cliffs. The Jason Islands are home to the striated caracara, albatrosses, Antarctic skuas and fur seals. The perceived decline may be due increased predation from gulls, skuas and introduced mammals. The three smaller skuas are called jaegers in American English. Major nest predators include Arctic foxes and skuas. Many chicks and eggs are lost to predators such as skuas and sheathbills.