Ivory gull narrower os pubis, and potentially more flexibility in skull kinetic structure. Structurally, it is most similar to the kittiwakes; however, recent genetic analysis based on mtDNA sequences shows that Sabine's gull is the ivory gull's closest relative, followed by the kittiwakes, with Ross's gull and swallow-tailed gull sharing a clade with these species. "Pagophila" is maintained as a unique genus because of the bird’s morphological, behavioral and ecological differences from these species. Colloquial names from Newfoundland include slob gull (from "slob", a local name for drift ice) and ice partridge, from a vague resemblance to a ptarmigan. This species is
Fork-tailed storm petrel is along the coast of the northern Pacific Ocean, extending from northern California to northeast Asia. They mainly feed on planktonic crustaceans, small fish and squid, but will also consume offal. Similarly to other storm-petrels, it forages by picking food of the surface of the water while in flight. The fork-tailed storm petrel is small seabird that is 20 cm in length with a wingspan of 45.9 cm. Its foraging behaviour resembles other storm-petrels, where it flies with short stiff wingbeats close to the surface of the water. Despite its name, the forked tail in this bird is not always