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Their favored prey in river habitats are salmon and trout. With adult females reaching 15 to 20 pounds, and a wingspan of between six to eight feet, the Steller’s size strikes an impressive and imposing figure. Females vary in weight from 6,2 to 9,5 kg (13.5 to 21 lb), while males being rather lighter with a weight range of 4,9 to 6,8 kg … Their call is similar to the white-tailed eagles but deeper. Like all eagles, it belongs to the family Accipitridae. Because of these threats, a relatively restricted range, and small population numbers, Steller's sea-eagles are listed as globally vulnerable. These eagles are exceptionally vocal for raptors and have a throaty, raspy bark-like call that sounds much like typical gull calls. Water pollution and overfishing are destroying critical food supplies, while logging operations often remove trees that are needed for nesting or hunting perches. In terms of weight and size, the Steller’s Sea Eagle and the Harpy Eagle are the largest. These are monogamous birds that form pair bonds after soaring courtship flights. The nests are generally 50-150 feet above the ground, positioned on a rocky outcropping or at the top of a mature tree. This is a massive, heavy raptor, and its massive, heavy bill is strongly hooked and bright yellow. The legs are feathered with white bloomers, and the feet are yellow with black talons. Females vary in weight from 6,2 to 9,5 kg (13.5 to 21 lb), while males being rather lighter with a weight range of 4,9 to 6,8 kg (10.8 to 15 lb). These eagles are believed to have a lifespan of about 20 years or more. Preserving habitat is essential for attracting these raptors, as well as protecting proven nesting areas. The average weight is variable, possibly due to seasonal variation in food access or general condition of eagles, but has been reported as high as a mean mass of 7,757 g (17.101 lb) to a median estimate weight of 6,250 g (13.78 lb), excluding expired eagles … The cere and gape are also bright yellow and emphasize the bill's large size. Genders are similar though females are notably larger with heavier bills than males. Choose reputable tour operators with experienced guides, and specifically ask about opportunities to see these birds to be sure there are sighting opportunities. The wingspan is from 1.95 to 2.5 m (6 ft 5 in to 8 ft 2 in) and the wing chord measurement is 56 to 68 cm (22 to 27 in). Typically, a pair will maintain two to four nests in one breeding territory and use alternate nests from year to year. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board, carnivorous and eat a wide variety of prey. A small number of birds remain in Kamchatka over the winter but the majority fly south to the Kuril Islands, Russia and Hokkaidō, Japan. Steller’s sea eagles are monogamous, they are often seen in breeding pairs throughout the breeding season, usually lasting from February through August. Steller’s sea eagle mainly feeds on fish. Steller’s sea eagle (Haliaeetus pelagicus) is a large and beautiful bird of prey. They are dark but dramatically colored with white tail, shoulders, rump, thighs and forehead. Named after German naturalist Georg Steller, these powerful members of the Accipitridae bird family are amazing, and every birder should learn more about how to protect them. Juvenile birds do not achieve their full adult plumage until they are four years old. Steller’s sea eagle is classified as vulnerable by the International Union for Conservation of Nature (IUCN). Steller’s sea eagle can range in total length from 85 to 105 cm (2 ft 9 in to 3 ft 5 in), apparently males average about 89 cm (2 ft 11 in) in length, while females average about 100 cm (3 ft 3 in), marginally shorter on average than the harpy eagle and about 65 mm (2.6 in) shorter than the Philippine eagle. Eggs hatch between May and June, with fledging taking around 70 days. The easiest way to find these birds is to opt for a dedicated tour that includes birding and wildlife watching. Three types of hunting behaviors have been observed, hunting from a perch, hunting on the wing while circling 6 to 7 meters (20 to 23 feet) above the water, and hunting in shallow water. In winter, however, they will gather in communal roosts near rich food sources, such as fish spawning grounds or rare areas of open water. These mainly include habitat alteration, industrial pollution, and overfishing, which in turn decrease their prey source. However, large numbers can be seen congregating on particularly productive salmon rivers due to an abundant food supply. It is a powerful eagle with black and white plumage and huge beak. Named after German naturalist Georg Steller, these powerful members of the Accipitridae bird family are amazing, and every birder should learn more about how to protect them. Steller’s sea eagles breed only in eastern Russia, around the Sea of Okhotsk and on the Kamchatka Peninsula. During the summer breeding season, these raptors spread out slightly further north along the Pacific coast. Learn tips for creating your most beautiful (and bountiful) garden ever. Like all raptors, they clamp onto prey with talons as sharp as switchblades and cannot let go until the prey is dead. The mature Steller’s sea eagle is dark brown to black over the majority of its body, with strongly contrasting white on the lesser and median upper-wing coverts, underwing coverts, thighs, under-tail coverts and tail. In winter, they may also be found near coastal lagoons or in areas where fish are spawning. The yellow eyes are surrounded by a fleshy yellow eye ring, though it can be difficult to see. A dark morph plumage variation lacks the white shoulders but shares other traits with the more classically colored birds. Eagle of the sea: Often called the worlds most magnificent bird of prey, the Stellers sea-eagle is dark, impressive, the largest of all sea-eagles, and the heaviest known eagle. The Stellers sea-eagle is often easy to spot, with its dark body; white forehead, shoulders, tail, and thighs; and bright-yellow bill. There are no known predators of adult Steller’s sea eagles. The head is black-brown with white frosting on the crown and nape and a small white patch on the forehead. Steller's Sea Eagle These very large, powerful eagles are also striking in appearance. The body is black-brown with a prominent white patch on the shoulders. Steller's sea-eagles are generally solitary and require large territories to support their hunting habits. In Japanese, it is called ō-washi (large eagle or great eagle). Steller's sea-eagles are carnivorous and eat a wide variety of prey, including fish, waterfowl, larger birds, and mammals, and they will also occasionally eat carrion. This fact sheet can help! Steller’s sea eagle’s wingspan is one of the largest of any living eagle. In flight, this eagle's wings show prominent primary feather fingers. BIOMETRICS: Length : 85-94 cm Wingspan : 220-250 cm Weight : M : 5-6 kg – F : 7-9 kg. That white patch is visible both on top and beneath the wings in flight, and in bright light can make the wings look narrow or unbalanced. Besides its normal common name, the species has sometimes been referred to as the Pacific eagle or white-shouldered eagle. One of the heaviest raptors in the world, the Steller's sea-eagle can weigh up to 20 pounds. The egg-laying period normally lasts from April through May, and the typical incubation period is 38 days. This fact sheet can help! There are 1-3 eggs laid in each brood, though it is rare (but not unheard of) for more than one chick to survive. Vagrant sightings are rare because these raptors do not move great distances, but they are occasionally recorded as far east as Alaska and as far south as Taiwan. The extent of migration can vary widely depending on food supplies and winter ice coverage, and these birds don't always move far within their range. They may even stand in shallow water and snatch fish with their bills, and they often steal from other eagles or ospreys. Though they are listed as a National Treasure in Japan and are protected under a variety of laws in different countries, strict conservation measures are essential to ensure their survival. Accipitriforme Order – Accipitridae Family. Steller’s sea eagle lives near water; on narrow strips of coast, together with forested valleys along lower reaches of rivers. As is typical of birds of prey, the male is much smaller than the female and will weigh from 11 to 13 pounds. Philippine eagle (Pithecophaga jefferyi) average weight: 6.35 kg (14 lb) maximum weight: 8 kg (18 lb) 3. Harpy eagle (Harpia harpyja) average weight: 5.95 kg (13.1 lb) maximum weight: max: 9 kg (20 lb) 4. Steller's Sea Eagle, 250 cm (98.4 inches) Steller’s sea eagle is one of the largest birds of prey found … Displaying begins in March and consists of soaring high above the breeding area while calling. Among these, pink salmon and chum salmon are reportedly favored, sometimes intensely supplemented by grayling and three-spined stickleback. All eagle species are part of the Accipitridae bird family, along with hawks, kites, harriers, goshawks, and buzzards. They are diurnal and hunt during the day, either diving from a perch to snatch prey with their powerful talons, or else soaring to find their next meal. They are diurnal, meaning they are active during the day and rest during the night. A group of eagles is called a ‘convocation’. This species is also occasionally seen in North America, China, and North and South Korea. Juvenile birds show significant mottling in the wings and a thin dark band on the tail tip. In winter, some of these raptors migrate as far south as the Korean coast and along the coast of Hokkaido, Japan. They may even join mixed flocks with golden eagles and white-tailed eagles while feeding. 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