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
Four Mile Fork, Virginia the city, resulting in some decline in business activity and the closure or relocation of several prominent businesses. Since the 1990s, however, new development to the south along Routes 1 and 208 and the redevelopment of older commercial properties around Four Mile Fork has renewed business interest in the community. Although most of the subdivision development between Four Mile Fork and the city limits of Fredericksburg had been completed by the 1990s, in-fill residential development continues throughout the area. Four Mile Fork, Virginia Four Mile Fork is an unincorporated community in Spotsylvania County, Virginia south of the city limits of