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[7] [19] [48] Owls have extremely large eyes which are nearly the same size in large species such as the snowy owl as those of humans. [49] The snowy owl's eye, at about 23.4 mm (0.92 in) in diameter, is slightly smaller than those of great horned and Eurasian eagle-owls but is slightly larger than those of some other large owls.
The Snowy Owl was part of the original edition of The Birds of America (sometimes called the Havell Edition [9] [7] after its printer, and sometimes called the "Double Elephant Folio", because of its size). It was printed on handmade paper 39.5 inches tall by 28.5 inches wide (100.3 × 72.4 cm).
Owls are divided into two families: the true (or typical) owl family, Strigidae, and the barn owl and bay owl family, Tytonidae. [2] Owls hunt mostly small mammals, insects, and other birds, although a few species specialize in hunting fish. They are found in all regions of the Earth except the polar ice caps and some remote islands.
Similar to other owls, the screech owl females are larger than the males of their species. They have a compact size and shape. They are small and agile, and about 7 to 10 inches tall and have a wingspan around 18 to 24 inches. They have prominent, wide-set feather tufts with bright yellow/green eyes.
Barrett said the last substantial sighting came in 2022, noting this year’s visit is part of a snowy owl irruption — an unpredictable migration pattern resulting from a successful breeding season.
The West Nile virus is likely to become more prevalent with climate change. In Ontario and northeastern Oregon there are confirmed great grey owl deaths from the virus. Testing of owls in the Yosemite area since 2005 has found evidence of the virus in that population. Due to their large size, great grey owls have few natural predators.
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The spotted owl has an average length of 43 cm (17 in), wingspan of 114 cm (45 in), and weight of 600 g (1.3 lb). Its eggs are a little over 50 mm (2.0 in) long, and are white and smooth with a slightly grainy texture.