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The great grey owl (Strix nebulosa) (also great gray owl in American English) is a true owl, and is the world's largest species of owl by length. It is distributed across the Northern Hemisphere , and it is the only species in the genus Strix found in both Eastern and Western Hemispheres.
Other common names include the ghost moth, great gray witch and great owlet moth. Thysania agrippina is of interest as a competitor for title of "largest insect". This may be true by the measure of wingspan—a Brazilian specimen with a wingspan of almost 30 cm (12 in) appears to hold the record. [ 1 ]
In the boreal forests, both the northern hawk owl and great grey owl appear to be in greater danger of great horned owl predation in years where the snowshoe hare have low populations. [161] [162] Great horned owls were the leading cause of mortality in juvenile spotted owls (30% of losses) and juvenile great grey owls (65% of losses).
[8] [18] Also, although 9 cm (3.5 in) shorter than the largest of the latter species, the Eurasian eagle-owl can weigh well more than twice as much as the largest great grey owl. [5] [20] The Eurasian eagle-owl typically has a wingspan of 131–188 cm (4 ft 4 in – 6 ft 2 in), [5] with the largest specimens possibly attaining 2 m (6 ft 7 in).
Blakiston's fish owl measures 60 to 72 cm (24 to 28 in) in total length, and thus measures slightly less at average and maximum length than the great gray owl (Strix nebulosa), a species which has a significantly lower body mass. [6] [15] The Eurasian eagle-owl (B. bubo) is sometimes considered the largest overall living owl species.
The great gray owl does not hoot, Williams said, but rather makes a series of “hoos” in a low pitch. Short-eared owls choose a variety of landscapes to make as their home. - Adobe Stock
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The wingspan of the great potoo and the oilbird can be more than 1 m (3.3 ft), the largest of the order. [71] [72] The largest species of the nightjar family, the great eared nightjar (Eurostopodus macrotis) of East Asia, is of smaller proportions. Great eared nightjars can reach 150 g (0.33 lb) in weight and 41 cm (16 in) in height. [73]