What is "arctic tern"

n. A migratory bird that travels between the Arctic and Antarctic, ''Sterna paradisaea''.

The Arctic tern (Sterna paradisaea) is a seabird of the tern family Sternidae. This bird has a circumpolar breeding distribution covering the Arctic and sub-Arctic regions of Europe, Asia, and North America (as far south as Brittany and Massachusetts). The species is strongly migratory, seeing two summers each year as it migrates along a convoluted route from its northern breeding grounds to the Antarctic coast for the southern summer and back again about six months later. Recent studies have shown average annual roundtrip lengths of about for birds nesting in Iceland and Greenland and c. for birds nesting in the Netherlands. These are by far the longest migrations known in the animal kingdom. The Arctic tern flies as well as glides through the air, performing almost all of its tasks in the air. It nests once every one to three years (depending on its mating cycle); once it has finished nesting it takes to the sky for another long southern migration.

Arctic terns are medium-sized birds. They have a length of and a wingspan of . They are mainly grey and white plumaged, with a red/orangish beak and feet, white forehead, a black nape and crown (streaked white), and white cheeks. The grey mantle is 305 mm, and the scapulae are fringed brown, some tipped white. The upper wing is grey with a white leading edge, and the collar is completely white, as is the rump. The deeply forked tail is whitish, with grey outer webs.

Arctic terns are long-lived birds, with many reaching fifteen to thirty years of age. They eat mainly fish and small marine invertebrates. The species is abundant, with an estimated one million individuals. While the trend in the number of individuals in the species as a whole is not known, exploitation in the past has reduced this bird's numbers in the southern reaches of its range.

The Arctic tern was known as sea swallow describing their slender shape as they swoop over the water.

Arctic Tern (1973 – 13 July 1998) was an American-bred, French-trained Thoroughbred racehorse and sire. He was campaigned at the highest level in Europe for three seasons, winning four of his twenty-one races including the Prix Thomas Bryon in 1975, the Prix de Fontainebleau in 1976) and the Prix Ganay (1977). He was also placed in several major races including the Prix Lupin and the Eclipse Stakes. After his retirement from racing, Arctic Tern became a successful breeding stallion with the best of his progeny being Bering.