This adept hunter sports a beautiful coat of grey feathers and the largest facial disc of any known bird. This versatile hunter’s prey ranges from small critters like scorpions and rodents to larger birds, including other raptors. The eggs laid by the females undergo an incubation period of 28-36 days. Scattered across the northern hemisphere, the average adult great grey owl can weigh as much as 1,900 g. While largely nocturnal, Great Grey Owls also hunt throughout the daytime. While a large portion of the hefty appearance of these 5 species of owls can be attributed to their fluffy feathers, make no mistake–these incredible raptors can grow to amazing sizes. The grey owls have feathered feet and legs coupled with long sharp talons. Bald Eagles do not get their entirely white head and tail until … Indian Eagle Owl. Like most owls, this feathered hunter is nocturnal and plays an important part in keeping the populations of prey animals in check. Wingspan: Up to 80 inches. The Great Horned Owl is the most common owl in the Americas, and gets its name from its iconic feathered “horns” that extend from the top of its head. Bald Eagle. The largest of the barn or masked owl family is the Tasmanian masked owl (Tyto novaehollandiae castanops), which weighs up to 1.4 kg (3.1 lb) and measures to 0.6 m (2.0 ft). The bird’s large head has no ear tufts. The great grey owls mainly hunt for food during the night, at dusk, and at dawn since they are very active during these times. They weigh between 630 and 800 grams (1.4 to 1.8 pounds) and have a wingspan of about 110 cm (43 inches). They also have yellow, relatively small eyes as well as the largest facial disc ever possessed by a raptor. Blakiston's Fish Owl is a massive owl at 60-75cm (24-30 in) and is possibly the largest species of owl. This majestic sub-variety of eagle owl is found only in a few specific areas of the world, and conservation efforts must be made in order to preserve its habitat. They also have yellow, relatively small eyes as well as the largest facial disc ever possessed by a raptor. The largest bird in the fossil record may be the extinct elephant birds of Madagascar, which were related to the ostrich. Thanks to Vicky Runnoe, Conservation Education Supervisor, Idaho Department of Fish and Game; Barb Forderhase, Education Specialist, Bureau of Land Management for the answers. Great Grey Owls do not build their own nests. These impressive birds are primarily monogamous, and share parental duties such as incubating eggs and hunting for food to sustain both parents during the incubation period. Males are responsible for ensuring that the young ones feed well and learn to fend for themselves such as learning to hunt for their own food. It has been known to abduct small cats and other animals. The average weight is 1.28 to 4.19 lbs and the average length is 61-84 centimeters with wingspans averaging 5 ft. Like most owl species, the males are smaller than the females. The Great Horned Owl is even powerful enough to bring down prey much larger than itself, though most of the time this isn’t necessary. The great grey owls are less aggressive compared to most birds. The Snowy Owl is thought to be one of the most agile owls, and is able to pluck small birds from their flight path mid-air. White-breasted sea eagle is one of the largest bird of prey of Indian Sub-Continent and also ranked in top 20 largest eagle species in the world. An adult ostrich weighs up to 150 kilograms and has a maximum height of 6 feet. Attacks by barred owls on hikers have been reported from Texas to British Columbia. A recent field study of the species showed males weighing from 3 to 3.75 kg (6.6-8.3 lbs), with the female, at up to 4.5 kg (10 lbs), being about 25% larger. Here in the UK, most of our birds are little-feathered friends that don’t get much bigger than a few inches tall. Great Grey Owls do not build their own nests. 4 They Live In Cacti. However, many of them do not live their full lives due to the many threats posed by the above-mentioned factors. The bird’s large head has no ear tufts. Deforestation and excessive fishing of the owl’s preferred food have already impacted the population enough to place it on the endangered species list. The Indian Rock Eagle Owl is the species of largest horned owl found in the Indian Subcontinent and found in hilly and rocky scrub forest.