Sabine's gull treated as comprising a monotypic genus; it is only placed within the genus "Larus" when the genus is enlarged. The black bill and notched tail are almost unique within the gulls, as they are shared only with the swallow-tailed gull of the Galapagos. On the basis of this the two species were often thought to be each other's closest relatives, a hypothesis ruled out by a number of behaviour and ecological differences. Mitochondrial DNA studies confirmed that they are not closely related, and the closest relative of the Sabine's gull is now thought to be the ivory gull, another Arctic
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