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 Four Mile Fork, Virginia Four Mile Fork is an unincorporated community in Spotsylvania County, Virginia south of the city limits of Fredericksburg. Its name derives from the junction of State Route 208, U.S. Route 1, and U.S. Route 1 Business, which is located approximately four miles south of downtown Fredericksburg. Four Mile Fork was also known as Thomas' Store. The community began developing as a suburb of Fredericksburg in the mid-20th century, with tract housing spreading out from the city along U.S. Route 1 Business (or Lafayette Boulevard). Commercial development remained predominantly small-scale and scattered until after the completion of