Snowy Owl

lunedì 3 ottobre 2011 06:31 Pubblicato da Progetto Foligno
The Snowy Owl was first classified in 1758 by Carolus Linnaeus, the Swedish Swedish naturalist who developed binomial nomenclature to classify and organise plants and animals. The name “scandiacas” is a Latinised word referring to Scandinavia, as the Owl was first observed in the northern parts of Europe. Some other names for the Snowy Owl are Snow Owl, Arctic Owl, Great White Owl, Ghost Owl, Ermine Owl, Tundra Ghost, Ookpik, Scandinavian Nightbird, White Terror of the North, and Highland Tundra Owl. It is the official bird of Quebec.

The Snowy Owl is a large, diurnal white Owl that has a rounded head, yellow eyes and black bill. The feet are heavily feathered. A distinctive white Owl, their overall plumage is variably barred or speckled with thin, black, horizontal bars or spots. Females and juveniles are more heavily marked than males – adult males may be almost pure white, although they have up to three tail bands. Adult females are distinctly barred throughout, and have from four to six tail bands. Immatures are very heavily barred throughout, and dark spotting may codominate or dominate the overall plumage. Intensity of dark spotting varies with the sex of the immatures, females being the darkest. Juveniles are uniformly brown with scattered white tips of down.
This large, white owl has a rounded head and yellow eyes. Both sexes of the Snowy Owl have dark bars and spots although they are heavier on the larger female; old males may be pure white. This usually silent bird will sometimes utter a shrill whistle and hoarse croak on breeding grounds.
Snowy owls have incredible vision. They can see from high up in the sky and swoop down silently to capture their prey. Like all owls they have good night vision. They are nocturnal and diurnal hunt at night but in the Arctic it doesn’t get dark in the summer so the owls hunt in the daylight too. When the owl gets food it swallows it whole or tears it into large pieces to swallow.

The Snowy Owl depends on lemmings for their major food source
. However, the lemming population fluctuates from year to year so when the supply gets too low, the snowy owl will migrate south in great numbers. 5-8 white eggs are laid in a nest lined with feathers, mosses, and lichens which is placed on the open tundra.

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