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Snowy Owl (Bubo scandiacus)

Until recently, the Snowy owl was considered the only member of the genus Nyctea (Nyctea scandiaca). With the advances, in recent years, of molecular biology it has been found that, despite their lack of obvious ear tufts, they are very closely related to the horned owls such as the Great Horned Owl. Consequently, it has been proposed that they are reclassifed as a species in the genus Bubo.

The Snowy Owl is found north of the limits of trees on the tundras of northern Scandinavia, Russia, Alaska & Canada, below the regions of land perpetually covered with snow & ice. During extremes of winter, particular when there is a scarcity of lemmings & hares (this happens periodically, every 4-5 years), they will migrate southwards & have been known to come as far south as London in the UK (it is possible this was an escaped captive bird), Bermuda in America, Pakistan & Korea. Snowy Owls have been known to breed in Fetlar in the Shetlands, but not since the mid 1970's. In November 2001, a wild Snowy Owl was seen in Suffolk, it was believed to have taken refuge from a storm on a container ship from Quebec, several others have also been seen in Belgium & the Netherlands.

The Snowy Owl is a species protected by special penalties in the UK. Throughout much of America, they are a protected species, but in Alaska it is legal for Alaskan residents to kill an unlimited number of Snowy Owls as long as it is for food or clothing (sale of the bird or parts of the bird is illegal). There is some evidence that Snowy Owls are being killed for their feet and eyes in America, for sale to Asian markets where they are highly valued.

In Snowy Owls the sexes are easily distinguished by their colouring, the males are almost pure white & the females have dark bars across all of the body & wings. It should be noted though that males do have some degree of marking & there are some highly marked males & some lightly marked females, which may be confused. The colouration may act as camouflage to the females when nesting & the lack of marking a similar protection for the males while hunting.

The Snowy Owls have the appearance of being a large bird, but much of the size is due to a heavy covering of heat retaining feathers. As protection against the cold ground on which it lives, the large feet of the Snowy Owl are also heavily feathered. Some of the individual feathers are up to 1.5 inches long, three time the length of those on the Great Horned Owl (Bubo Virginianus), its nearest rival in terms of feathering on the feet.

Because of its natural habitat in the frozen tundra, these owls will take a large variety of prey, due to its own size, some quite large, from voles to hares to birds up to the size of geese. They will also prey on other raptors such as short-eared owl, peregrine and gyrfalcons and buzzards. (They have also been preyed upon by gyr & peregrine falcons.) When all else fails, they will also eat fish & carrion. Its acute hearing enables it to catch prey under anything up to 10 inches of snow. The main prey of Snowy Owls, however, is lemmings. The Snowy Owls prefered method of hunting is "still-hunting", sitting on a suitable hill or outcrop waiting for the prey to come past, when it will accelerate rapidly & stoop onto the prey. Birds are often taken in flight & fish snatched off the surface of water. When food is very scarce, Snowy Owls can live off their reserves of fat for almost 6 weeks.

Again because of their location, nesting is usually on the ground, usually on hillocks or rocky outcrops. In Alaska nests may be on tidal flats or slopes near small lakes or marshes. The number of eggs laid varies with the abundance of food, ranging from 3 to 13. Following a particularly lean year, some may not breed at all. In a normal year between 5 & 8 eggs are laid, of which just over half may hatch & survive. Being on the ground, the nests are open to predation by a large number of prey, including Arctic Foxes, Skuas, huskies & Eskimos. The eggs are laid at irregular intervals & incubation starts when the first egg is laid. Incubation is done solely by the female & takes from 32 to 34 days. Initially the male provides all of the food, later both parents are involved. The young are fully fledged around 7-8 weeks after hatching. The first months after leaving its parents are very severe for the young Snowy Owls, as winter is approaching & there is virtually no daylight in the Arctic in that season. One estimate of the average lifespan of the Snowy Owl is 5 years, this is based on the estimates to maintain a stable population given the amount of food available & it may be very low, due to the very high mortality rate in the first year of life. A more reasonable estimate for lifespan in the wild is around 9-12 years. In captivity, a Snowy Owl can live up to 30 years.

As Snowy Owls often hunt close to their nesting site, it has been found that other large birds, such as Snow Geese, which are not normally preyed on, will nest close by. It is thought they are taking advantage of the Snowy Owls keeping other predators, such as Artic Foxes, out of the area.

Unlike many of the other owls, particularly the larger owls, Snowy Owls do not mate for life. They are a very nomadic bird & will have a different territory & different mate each season.

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Gallery

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Mythology & Folklore :

In Romania, it is said that the souls of repentant sinners fly to heaven as Snowy Owls.

Conservation Status

IUCN Red List : Least Concern (LC)

AOU Data :

Species Number : 376.0
Alpha Code : SNOW
Common Name : Snowy Owl
Longevity Record : 10yrs 9months

Also Called :