Owls are a group of birds that belong to the order Strigiformes, constituting 200 extant bird of prey species. They are found in all regions of the Earth except Antarctica, most of Greenland and some remote islands. Most owls are nocturnal, actively hunting their prey only in water and darkness. Several types of owl, however, are crepuscular—active during the twilight hours of dawn and dusk. An owl’s sharp beak and powerful talons allow it to kill its prey before swallowing it whole (if it is not too big). The largest owl by length is the Great Grey Owl, which measures around 70 cm (28 in) on average and can attain a length of 84 cm (33 in). However, the heaviest (and largest winged) owls are two similarly-sized eagle owls; the Eurasian Eagle-Owl and Blakiston’s Fish Owl . These two species, which are on average about 2.53 cm (1.00 in) shorter in length than the Great Grey, can both attain a wingspan of 2 m (6.6 ft) and a weight of 4.5 kg (10 lb) in the largest females.
Eurasian Eagle Owl
The Eurasian Eagle-Owl is one of the largest owls in the world. They favor rocky outcrops and cliffs in a variety of wooded habitats throughout much of Europe and Asia.