Birds
Gyrfalcon
Falco rusticolus · also called gyrfalcons
A gyrfalcon chases a ptarmigan across open Arctic tundra with sheer power and sustained speed rather than a dramatic aerial dive, the largest falcon alive doing what few other raptors even attempt: staying put through an entire Arctic winter that would drive most birds of prey south.
Overview
The gyrfalcon, Falco rusticolus, is the largest falcon species, native to Arctic and subarctic regions across North America, Europe, and Asia. It hunts ptarmigan and waterfowl through powerful direct pursuit and tolerates extreme winter cold most raptors avoid entirely.
Built for the cold, not the dive
While the peregrine falcon built its reputation on a spectacular high-speed stoop, the gyrfalcon leans instead on raw size, strength, and cold tolerance, a different but equally effective set of adaptations suited to life at the top of the world.
Status
Least Concern — widespread and stable across suitable Arctic and subarctic habitat throughout the Northern Hemisphere.
Gyrfalcon: common questions
How big is a gyrfalcon compared to other falcons?
The gyrfalcon is the largest living falcon species, notably bigger and more powerfully built than the peregrine falcon and most other falcon family members, a size advantage that supports its ability to take relatively large prey such as ptarmigan and waterfowl across open Arctic terrain.
Why do gyrfalcons come in such different colours?
A gyrfalcon can display a wide range of plumage colouration across its range, from nearly pure white individuals in the high Arctic to considerably darker grey or brown morphs found elsewhere, a degree of colour variation unusual within a single falcon species and one whose specific adaptive advantage across different regions is not fully settled.
How does a gyrfalcon survive such harsh Arctic winters?
Unlike many raptor species that migrate away from harsh winter conditions, a gyrfalcon is well adapted to remain in or near Arctic and subarctic habitat through winter, tolerating extreme cold that would pose a serious challenge for many other birds of prey, allowing it to maintain year-round access to its tundra hunting grounds.
Does a gyrfalcon hunt the same way a peregrine falcon does?
Not exactly, since a gyrfalcon typically relies on powerful, direct pursuit flight across open terrain rather than the extreme high-speed diving stoop most associated with the peregrine falcon, a hunting style suited to chasing ptarmigan and waterfowl across the open tundra and mountainous habitat the gyrfalcon favours.