Gyrfalcon

Falco rusticolus

The gyrfalcon, Falco rusticolus, is the largest falcon and a bird of Arctic and subarctic tundra, sea cliffs, and open northern landscapes. Its plumage varies from dark gray-brown through silver gray to nearly white, with regional and individual variation rather than a single standard color. Broad wings, deep chest muscles, and heavy feet let it overpower ptarmigan, seabirds, ducks, and other cold-country prey. Gyrfalcons nest on cliffs or in old raven and raptor nests, and their breeding success often follows the abundance of ptarmigan and other quarry.

Human contact with gyrfalcons is mostly through licensed falconry, captive breeding programs, zoo collections, and field research. They are high-demand birds that require experienced handlers, large weather-safe mews or aviaries, precise weight management, and access to whole-prey diets; they are not pets. Many countries regulate possession, import, export, and hybrid breeding closely because wild populations are valuable and vulnerable to illegal take. Conservation work tracks nest occupancy, prey cycles, contaminants, and climate-driven changes in the Arctic. For rehabilitation centers, minimizing stress and preserving feather condition are central because a released gyrfalcon must fly and hunt in harsh open country.