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 flycatcher of this species. The fork-tailed flycatcher has the longest tail relative to body size of any bird on earth. The tail in adult males is 2–3 times longer than the length of the bird from the bill to the base of the tail. This species is primarily an insectivore, but will switch to berries and small fruits during winter if insects become scarce. Fork-tailed flycatcher The fork-tailed flycatcher ("Tyrannus savana") is a passerine bird of the tyrant flycatcher family, and is the member of a genus typically referred to as kingbirds. This bird occurs in a wide variety of habitats