Answer: The biggest owl is the Eurasian Eagle Owl. It has a wingspan of one meter or more when spread, and weighs between 3 and 5 pounds when fully grown.
The largest known species is the Blakiston’s Fish Owl which can measure up to 1.9 meters in length. However, it seldom exceeds 90 cm in height excluding its tail feathers which add 150 cm or so, making it much taller than it is long.
The Eurasian Eagle Owl is closely related to the Snowy Owl and is considered one of the heaviest species of owl. They are important hunters that prey on medium-sized mammals and birds. The nests of these owls can be found in a large variety of locations including cliffs, rocky outcrops, and even trees.
A single egg with a long incubation is the average number of eggs for this species.
The Eurasian Eagle Owl is found mainly in Europe, Asia, and Africa. It lives mainly on the larger mammals which include hares, rabbits, marmots, squirrels, and occasionally foxes or young deer. They feed intensively when prey becomes available. They will only eat what they kill.
Furthermore, they are nocturnal hunters and rely on surprise as a tactic because it does not have very good eyesight for hunting during the day. The Eurasian Eagle Owl has been known to feed on even domestic cats and medium-sized dogs, but mainly preys on big rodents such as hamsters and pet rats.