Bubo scandiacus
Length: 20-30 in Wingspan: 50-60 in Weight: 3-6 lbs
Identification:
White overall with variable black barring/spotting.
Distribution:
Range map by IUCN
Cool Facts:
Though the extent of barring on male and female Snowy Owls can overlap, the whitest birds are always males and the most heavily barred birds are females. In the Harry Potter movies, all the owls that played Hedwig were male.
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References:
Bird on the Move 