Gyrfalcon (Falco rusticolus) — Vorstman's Guide to the Birds of North America

Voice

On territory the Gyrfalcon gives a deep, hoarse series of cries, slower and heavier in tone than those of the Peregrine Falcon. Between mates and during food exchanges a softer, chattering sound is used.

Listen: CallXC1166841

Recording: Lars Edenius — CC BY-NC-SA 4.0 · Lycksele Municipality, Västerbottens län, Sweden · xeno-canto

Identification

A large, broad-chested falcon with relatively long wings and a long tail, occurring in three main colour forms: a nearly pure white form with fine black spotting, a grey form with dense brown-grey barring, and a dark form nearly uniform slate-grey to blackish-brown. All forms lack the Peregrine Falcon's sharply defined moustache and have a heavier, less pointed wing shape.

Confusion species

Peregrine Falcon is smaller and slimmer with a broad, sharply defined black moustache, whereas the Gyrfalcon has fainter facial markings and a heavier, less streamlined build. Prairie Falcon is likewise pale but considerably smaller, with the distinctive dark armpit triangle the Gyrfalcon lacks. In flight the Gyrfalcon is recognised by slow, deep wingbeats rather than the fast, stiff beats of the smaller falcons.

Habitat

Cliffs on the open, treeless Arctic tundra provide the nesting habitat, with wide views over the hunting grounds. Outside the breeding season the Gyrfalcon seeks similarly open terrain: coastal plains, dunes, prairie and sagebrush (grey-green wormwood scrub of the dry western interior) steppe, where it hunts waterfowl and other medium-sized game.

Where the bird is most often found, arranged by the USNVC — the vegetation classification of the United States and Canada — and CMECS for sea and coast.

Range and movements

Breeds circumpolar around the entire North Pole, from Alaska and northern Canada to Greenland and Scandinavia. Most birds are year-round residents, remaining near their territory even through the dark polar winter; some young and northern birds move south in severe winters as far as the northern United States.

Breeding (summer)
Winter
dark = core range, pale = thinly spread

The map is a density field, not a drawn range boundary: it is built from the records themselves and therefore does not follow state or national borders. Both the seasonal colour and the depth of colour come, cell by cell, from the records of GBIF (2006–2026), counted per 0,7° cell and divided by all bird records in that same cell, so that the density of birdwatchers does not count. Every cell is counted separately for June–July, December–January and the migration months, and takes the colour of the season that wins there; a cell is only called summer or winter where the other season is nearly empty. Country outlines: Natural Earth (public domain).

Where and when to look

In severe winters, watch open coastal plains and large river deltas in the northern United States and southern Canada, where a Gyrfalcon often lingers near a concentration of waterfowl; its slow, heavy wingbeat sets it apart from a Peregrine Falcon at once.

Conservation

The global population is stable and listed as Least Concern (LC), thanks to its remote and largely undisturbed breeding range in the high Arctic. Climate change and the northward shift of prey species and competitors are being monitored as possible long-term risks.

Scientific name

Falco rusticolus | Linnaeus, 1758

Linnaeus described the species in 1758 as Falco Rusticolus; the genus has remained unchanged since, hence no parentheses around author and year. Falco is Latin for 'falcon'; rusticolus combines rusticus ('rural, rough') with colere ('to inhabit'), referring to the remote, inhospitable regions where the species lives.