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  3. Great Grey Owl

One of the 3 wood owls on WAnimals

Great Grey Owl (Strix nebulosa)

Birds · Strigiformes · Strigidae

Great Grey Owl

Strix nebulosa

Least Concern

The species is abundant and widely distributed; it faces no significant short-term risk.

Spotted something wrong?

It is the longest owl in the world by total body length, though its body is deceptively light beneath extremely dense, fluffy plumage.

Weight

580 g – 1.9 kg

Size

61 cm – 84 cm

Life expectancy

13 years

Diet

Carnivore

Feeds mainly on other animals.

Activity

Irregular activity

Active at irregular times, by day or night depending on circumstances.

Social structure

Solitary

Lives and hunts alone, joining others only to breed.

Temperate forestTundra
15countries29parks18same family

AI-generated images: illustrations, not photographs.

Fun facts

  • It is the longest owl in the world by body length, despite being very light.
  • It can detect rodents hidden under as much as 60 cm of snow by sound alone.
  • Its asymmetric hearing lets it pinpoint prey with extreme accuracy.
  • sentidosIt has the largest facial disc of any owl known, which markedly improves its ability to hear small rodents beneath the snow.

Life cycle and biology

Skeleton type
Vertebrate - pneumatised bony skeleton (bird)
Habitat and environment
Dense boreal coniferous forest of North America and Eurasia, including the mountains of the western United States
Birth weight
37.5 grams
Size at birth
Semi-altricial, with white down and its eyes open on hatching
Sexual maturity
1 year (though effective breeding is usually delayed to 3-4 years)
Gestation / incubation
28-36 days
Litter / clutch size
2 to 5 eggs per clutch (most commonly 3-4)
Life expectancy in captivity
Unconfirmed reports of up to 27-40 years in captivity

Sources consulted: AnAge (genomics.senescence.info) · Earth Life · The Owl Pages · Animal Diversity Web · The Animal Facts · Animalia.bio · California DFG life history account · Wikipedia (Great grey owl)

Where to find it

Best time: Winter, when it comes down into clearings and open ground and hunts in broad daylight over the snow; it is especially visible in irruption years, when birds move south.

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Where to see it

Parks and dive sites where this species has been documented — showing 10 of 29.

Related species

Other species in the catalogue with the most in common with Great Grey Owl — same habitat, park, country, tags or family.

Same taxonomic family
Same taxonomic family
Same taxonomic family
Same taxonomic family
Same taxonomic family
Same taxonomic family

Keep exploring

Based on what we already know about great grey owl.

Share an experience, a fun fact or a tip for seeing the great grey owl.
See full glossary
This page in other languages: Español · Deutsch · Français · Português · Italiano

The pins mark the parks where its presence is documented.

See its range on the interactive map→
SarekSweden
Pallas-YllastunturiFinland
Urho KekkonenFinland
DenaliUnited States
Wood BuffaloCanada
Sikhote-AlinRussia
VoyageursUnited States
Isle RoyaleUnited States
Riding MountainCanada
Gates of the ArcticUnited States
See all 29 parks
Least Concern

Great Horned Owl

Bubo virginianus

Least Concern

Long-eared Owl

Asio otus

Least Concern

Northern Hawk-Owl

Surnia ulula

Least Concern

Boreal Owl

Aegolius funereus

Least Concern

Eurasian Pygmy Owl

Glaucidium passerinum

Tawny OwlLeast Concern

Tawny Owl

Strix aluco

CountriesFinland
ParksSarekSweden
TagsCarnivore
Carnivore
Variable activity
Solitary
Bird
Temperate forest
Tundra

Europe10

Asia3

North America2

Finland
Russia
Canada
Sweden
United States
Norway
Belarus
Estonia
Finland
Germany
Latvia
Lithuania
Norway
Poland
Sweden
Ukraine
China
Mongolia
Russia
Canada
United States