Gyrfalcon

The gyrfalcon (Falco rusticolus) is the largest falcon in the world, breeding around the Arctic in northern Eurasia and North America. It is about the size of the largest buteos but probably somewhat heavier, with pointed wingtips on broad-based wings and a tail slightly longer than a peregrine's. Pale, intermediate and dark morphs occur, and the white pale morph, which gives the bird its Japanese name, is white overall with black scaling above and fine dark markings below, some individuals lacking them entirely. It lives on Arctic tundra and in the surrounding forest and highlands, moving to open coast and moorland in winter. One account derives the English name from the Greek gyros, circle, for the bird's habit of circling as it searches for prey, and in falconry the male is called a gyrkin. Long associated with hunting and falconry, it is the official bird of Canada's Northwest Territories, and the white falcon in the crest of Iceland's coat of arms is a white gyrfalcon. A few birds reach Hokkaido and elsewhere in Japan in winter.

Source: Wikipedia (CC BY-SA 4.0)

The Gyrfalcon lives 15-20 years.

The Gyrfalcon grows to Males 48-61cm and 805-1,350g with a wingspan of 110-130cm; females 51-65cm and 1,180-2,100g with a wingspan of 124-134cm.

Males are 48-61 cm long and weigh 805-1,350 g, with reported averages of 1,130 or 1,170 g and a wingspan of 110-130 cm; females are bulkier at 51-65 cm, 1,180-2,100 g and a wingspan of 124-134 cm.