Guide to North American Birds

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Adult, gray morph. Photo: Scott Weins/Great Backyard Bird Count

Gyrfalcon

Falco rusticolus

This formidable predator, the largest falcon in the world, reigns over barren tundra and desolate coasts in the high Arctic. There it preys mostly on large birds such as ptarmigan and waterfowl, overtaking them in powerful flight. Most Gyrfalcons remain in the far north all year; only a few come as far south as the Canadian border in winter, providing thrills for birders. Variable in color, Gyrs may be blackish, gray, or stunningly white.

Conservation status	Has declined in parts of arctic Europe, but North American populations are probably stable. Illegal taking of young for falconry could be a problem in some areas, but most nest sites are remote from human disturbance.
Family	Falcons
Habitat	Arctic barrens, seacoasts, open mountains. Breeds in Arctic regions having open tundra for hunting and cliffs for nesting sites. Often occurs along coasts and rivers, where prey may be more abundant. Mostly in treeless country, but occurs along the edges of northern forest in some places. Wintering birds south of Arctic tend to be either along coast or in very open country inland.

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Feeding Behavior

Hunts by scanning its surroundings from a perch on a high rock, or while flying. Prey may be taken by surprise, the falcon approaching very low over the ground, or may be pursued relentlessly in flight over long distances.

Eggs

Usually 3-4, sometimes 2-5. White or creamy white, spotted with reddish-brown. Incubation is by both parents, but female does more. Young: For first 1-3 weeks, young are brooded most of time, mostly by female; male does all or most of hunting during this time, bringing food which female feeds to the nestlings. After 2-3 weeks, female hunts also. Age of young at first flight about 45-50 days.

Young

For first 1-3 weeks, young are brooded most of time, mostly by female; male does all or most of hunting during this time, bringing food which female feeds to the nestlings. After 2-3 weeks, female hunts also. Age of young at first flight about 45-50 days.

Diet

Mainly birds, some mammals. Feeds mostly on medium-sized to large birds. Ptarmigan are mainstays of diet on Arctic tundra, while coastal Gyrs may take more gulls, ducks, and geese, but numerous other species eaten on occasion. Also some mammals, including lemmings, ground squirrels, hares. Wintering birds in west have been seen taking birds as large as Sage Grouse.

Nesting

Pairs may occupy nest sites very early in season, even in late winter. Members of pair display at nest site with bowing and scraping motions; male brings food to female. Nest: Most nest sites are on cliffs, and most are on old nests built by other birds, such as ravens or Golden Eagles. Sometimes breeds on open ledges with no nest structure present, and sometimes uses old nests in trees, such as spruce or poplar (tree nesting is frequent in some areas). Does not add material to existing nests.

Illustration © David Allen Sibley.
Learn more about these drawings.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

Many adults are permanent residents in far north, even above Arctic Circle, but many immatures move southward for winter. Northernmost adult breeders may also migrate.

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Migration

Many adults are permanent residents in far north, even above Arctic Circle, but many immatures move southward for winter. Northernmost adult breeders may also migrate.

All Seasons - Common
All Seasons - Uncommon
Breeding - Common
Breeding - Uncommon
Winter - Common
Winter - Uncommon
Migration - Common
Migration - Uncommon

Songs and Calls

A chattering scream, kak-kak-kak-kak.

begging call of captive

Audio © Lang Elliott, Bob McGuire, Kevin Colver, Martyn Stewart and others.
Learn more about this sound collection.

How Climate Change Will Reshape the Range of the Gyrfalcon

Audubon’s scientists have used 140 million bird observations and sophisticated climate models to project how climate change will affect this bird’s range in the future.

Zoom in to see how this species’s current range will shift, expand, and contract under increased global temperatures.

Climate Threats Near You

Climate threats facing the Gyrfalcon

Choose a temperature scenario below to see which threats will affect this species as warming increases. The same climate change-driven threats that put birds at risk will affect other wildlife and people, too.