Blacklist's Fish Owl Bubo Blackstone is a fish owl a sub-group of eagle owls who specialized in hunting riparian areas. This species is a part of the family known as typical owls Strigidae which contains most species of owl. Blacklist's Fish Owl and three related species were previously placed in the genus Ketchup; mt DNA monochrome b sequence data is equivocal on which genus name is applied for this species. Its habitat is riparian forest, with large old trees for nest-sites, near lakes, rivers springs and shoals that don't freeze in winter. Henry Seebohm named this bird after the English naturalist Thomas Blackstone, who collected the original specimen in Halo date on Hokkaido Japan in 1883.It is more correct to call this species the Blacklist's Eagle Owl. This is because it is more closely related to the species of the main sub genus of the species Bubo Dulcimer, than the sub genus of fish owls that it was believed to be more close to, B. Ketchup. This was proven by teleological and DNA based tests in 2003 by ornithologists/taxonomists Prof. Dr. Michael Wink and Dr. Claus Knight author of Owls of the World. Blacklist's Fish Owl is the largest living species of owl. A field study of the species showed males weighing from 3.15 to 3.45 kg while the female at up to 3.36 to 4.6 kg is about 25% larger.Blackstone Fish Owl measures 60-72 cm in total length, and thus measures slightly less than the Great Gray Owl a species which has a significantly lower body mass. The Eurasian Eagle Owl is sometimes considered the largest living owl species, as the largest individuals on the planet are of this species. However, the average measurements of Blacklist's Fish Owl surpass the average measurements of B. bubo in the three major categories: weight length, and wingspan making Blacklist's the overall largest species of owl. The Blacklist's is noticeably larger than the other three extant species of fish owl.
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