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
Gull Island (Tasmania) Gull Island (Tasmania) The Gull Island, part of the Passage Group within the Furneaux Group, is an granite island, located in Bass Strait southeast of Cape Barren Island, in Tasmania, in south-eastern Australia. The island is a conservation reserve and with the Passage and Forsyth islands, the Gull Island forms part of the Forsyth, Passage and Gull Islands Important Bird Area (IBA), identified as such by BirdLife International because it supports over 1% of the world populations of little penguins and black-faced cormorants. Recorded breeding seabird and wader species include little penguin, short-tailed shearwater, white-faced storm-petrel, Pacific gull, silver gull,