The largest species of owl is the Blakiston's fish owl, known scientifically as Bubo blakistoni. It is primarily found in the forests and river valleys of eastern Russia, Japan, and parts of China. This owl can have a wingspan of up to 6 feet (1.8 meters) and can weigh around 4.5 kilograms (10 pounds). They thrive near water bodies and are known for their unique hunting strategies, mainly preying on fish and other aquatic creatures. Their striking appearance, featuring large ear tufts and a powerful build, makes them a remarkable bird in the owl family.