This is incorrect, and the Eurasian eagle-owl (Bubo Bubo) is the second largest owl species.
The largest living species of owl on Earth is the endangered Blakiston's fish owl (Bubo blakistoni)
en.wikipedia.org/wiki/Blakiston%27s_fish_owl
Length: 60 to 72 cm (24 to 28 in)
Weight: 2.95 to 4.6 kg (6.5 to 10.1 lb)
Wingspan: 178 to 190 cm (5 ft 10 in to 6 ft 3 in)
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The largest owl is believed to be the Eurasian eagle owl. These owls are said to be as tall as 28".
The Elf owl is 13-30 centimeters and the The Northern Pygmy Owl is between 16 and 18 centimeters