Great Grey Owl (Strix nebulosa) lives in boreal forests across Northern Hemisphere. It feeds on small mammals rodents. Its conservation status is Least Concern.
Fascinating facts about the Great Grey Owl
- At up to 84 cm long, the great grey owl stretches longer than any other owl, with females averaging 72 cm and males 67 cm. Its wings can span more than 152 cm, though females average 142 cm and males 140 cm. Despite this length, the bird's body is light, adults weigh between 580 g and 1,900 g, averaging 1,290 g for females and 1,000 g for males. The owl's huge facial disc, the largest of any raptor, amplifies sound, letting it hunt with precision despite its feather-filled bulk. This combination of length and lightness lets the owl glide silently over boreal forests, conserving energy while patrolling vast territories.
- When prey burrows under deep snow, the great grey owl can hear it through up to 60 cm of packed drifts and then plunge straight into the white, crashing to a depth roughly equal to its own body size to snatch the rodent. Only this species and, less often, other large Strix owls are known to "snow-plunge," a behavior that depends on its extraordinary auditory acuity and asymmetrical ear placement.
- Great grey owls lay between two and five eggs, each about 42.7 mm wide and 53.5 mm long, and the female incubates them for roughly 30 days (28-36 days). After hatching, the owlets stay in the nest for three to four weeks, then jump or fall and must climb back up using beak and feet until they can fly a week or two later. The male provides all the food during this period, while the female guards the nest fiercely. This intense parental investment means that any drop in small-mammal abundance can halt breeding entirely, linking the owl's reproductive success directly to the health of its rodent prey base.
- In the wild, great grey owls typically live 10-20 years, with an average of seven years, but some individuals reach far older ages. Captive birds can live about 27 years, and National Geographic documented one reaching 40 years, while the longest-recorded wild individual was around 19 years old.
- Timber harvest is the greatest danger to the great grey owl because it removes the large live and dead trees they need for nesting, perching, and cover. When clear-cuts lack standing snags, the owls lose hunting perches and the dense canopy that shelters juveniles. The species is far more common in areas protected from logging, highlighting how forest management directly influences their numbers. Preserving mature coniferous stands therefore safeguards the owls.
Sources
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At a glance
RangeNorthern Hemisphere
HabitatBoreal forests
DietSmall mammals rodents
About the Great Grey Owl
In the whispering silence of the boreal forest, the Great Grey Owl glides with spectral elegance, its soft, feathery wings beating in a slow, hypnotic rhythm as it navigates the mist-shrouded landscape with precision and stealth. With eyes that shine like moonlit pools, this master of the night watches and waits, its acute hearing tuned to the faintest stirrings of its prey beneath the snow. As it takes to the skies, its wings unfold like a ghostly cloak, and the owl becomes one with the darkness, a phantom hunter in a realm of shadow and silence.
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Great Grey Owl photographed on Feravox
