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 drongo shown in any animal other than humans. Two to four eggs are laid in a cup nest in a fork high in a tree. Drongos are brood hosts for African Cuckoos and Jacobin Cuckoos. Its populations are genetically highly structured, and four races are accepted. The races "D. a. modestus" (Príncipe) together with "D. a. coracinus" and "D. a. atactus" (Bioko to west and central mainland Africa, from Guinea east to western Kenya and south to Angola) are usually split as a separate species, the velvet-mantled drongo, "D. modestus" (Hartlaub, 1849). Fork-tailed drongo The fork-tailed drongo, also called the common