|Range of H. albicilla Nesting range Wintering range Year-round range|
Falco albicilla Linnaeus, 1758
The white-tailed eagle (Haliaeetus albicilla), also known as the ern, erne, gray eagle, Eurasian sea eagle and white-tailed sea-eagle, is a large bird of prey in the family Accipitridae which includes other raptors such as hawks, kites, and harriers. They are found in Eurasia, near large bodies of open water with an abundant food supply and old-growth trees for nesting. They are considered a close cousin of the bald eagle (Haliaeetus leucocephalus).
The first formal description of the white-tailed eagle was by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Falco albicilla. The genus Haliaeetus was introduced in 1809 by the French naturalist Marie Jules César Savigny in the Description de l'Égypte. The name Haliaeetus is New Latin for "sea-eagle", from Ancient Greek hali-, "sea-" and aetos, "eagle". The specific albicilla, "white-tailed", is from New Latin albi-, "white" and cilla, "tail".
The white-tailed eagle is a very large bird. It measures 66–94 cm (26–37 in) in length with a 1.78–2.45 m (5.8–8.0 ft) wingspan. The wingspan, with a midpoint of 2.18 m (7.2 ft), is on average the largest of any eagle. The Steller's sea eagle, larger in both weight and total length, is the closest rival for median wingspan amongst living eagles. The bald eagle is roughly the same size as the white-tailed eagle, although has a shorter average wingspan and usually longer total length, due to a longer tail. Females, typically weighing 4–6.9 kg (8.8–15.2 lb), are slightly larger than males, which weigh 3.1–5.4 kg (6.8–11.9 lb). The record weight for the species was 7.5 kg (17 lb) for a specimen from Scotland, while a more recent huge female from Greenland reportedly spanned 2.53 m (8.3 ft) across the wings. Among standard measurements, the wing chord is 55.2–71.7 cm (21.7–28.2 in), the tail is 25–33 cm (9.8–13.0 in), the tarsus is 9.2–10.1 cm (3.6–4.0 in) and the exposed culmen is 6–6.5 cm (2.4–2.6 in). Size variation is generally a clinal trend: measurements of eagles from Greenland are in general larger than in other populations of the species, while those from the (now discontinuous) population in the Middle East, at the southern extreme of this species distribution, are the smallest in the species. The white-tailed eagle is sometimes considered the fourth largest eagle in the world  and is on average the fourth heaviest eagle in the world.
This species has broad "barn door" wings, a large head and a large thick beak. The adult is mainly grayish-brown except for the slightly paler head and neck, blackish flight feathers, and distinctive white tail. All bare parts are yellow in color, including both the bill and the legs. In juvenile birds, tail and bill are darker, the tail becoming white with a dark terminal band in sub-adults.[page needed] The combination of mousy-brown coloration, broad, evenly held wings, white tail, strong yellow bill and overall large size render the white-tailed eagle essentially unmistakable in its native range.
Second year birds have paler bellies and third year birds are darker. It has four or five body moults before reaching adult plumage. Only a proportion of the flight feathers are moulted each year. Moults more or less continuously, although it may pause in winter if food is in short supply.
Distribution and systematics
This large eagle breeds in northern Europe and northern Asia, and winters further south. It is a rare winter visitor to India. The largest population in Europe is found along the coast of Norway. The population in 2008 stood at 9,000–11,000 pairs. They are mostly resident, only the northernmost birds such as the eastern Scandinavian and Siberian population migrating south in winter. Birds from eastern Russia rarely migrate into Alaska.
Small disjunct resident populations occur in southwesternmost Greenland and western Iceland. The former has been proposed as a distinct subspecies, groenlandicus, based on their very large size and body proportions. However, the species is now considered monotypic and the size variation is clinal according to Bergmann's rule.[page needed] A recent genetic study of mitochondrial DNA is consistent with this idea. Greenlandic white-tailed eagles form, on evolutionary time scales, a relatively recently founded population that has not yet accumulated many unique genetic characteristics. However, the population appears to be demographically isolated and deserves special protection.
The white-tailed eagle forms a species pair with the bald eagle. These diverged from other sea eagles at the beginning of the early Miocene (c. 10 mya) at the latest, possibly (if the most ancient fossil record is correctly assigned to this genus) as early as the early or middle Oligocene, about 28 mya.
As in other sea-eagle species pairs, this one consists of a white-headed (the bald eagle) and a tan-headed species. They probably diverged in the North Pacific, spreading westwards into Eurasia and eastwards into North America. Like the third large northern species, Steller's sea eagle, adults have yellow feet, beaks and eyes.
Currently, eagles only occur in the Hawaiian Islands as vagrants, but Quaternary bones of Haliaeetus have been found on three of the major islands. An ancient DNA study published in 2015 characterized the rapidly evolving mitochondrial control region of one of these specimens. DNA from a ∼3500-year-old sea eagle skeleton found in a lava cave on Maui was sequenced. Phylogenetic analyses suggested that the Hawaiian eagle represents a distinct (>3% divergent) mtDNA lineage that is most closely related to extant white-tailed eagles. Based on fossil calibration, the Hawaiian mtDNA lineage probably diverged around the Middle Pleistocene. Thus, although not clearly differentiated in morphology from its relatives, the Hawaiian eagle likely represented an isolated, resident population in the Hawaiian archipelago for more than 100,000 years, where it was the largest terrestrial predator. The reasons for its extinction are unknown.
The white-tailed eagle's diet is varied, opportunistic and seasonal. Prey specimens can often include fish, birds and mammals. Many birds live largely as scavengers, regularly pirating food from otters and other birds including cormorants, gulls, ospreys and various other raptors. Carrion is often the primary food source during lean winter months, with fish and ungulates preferred but everything from cetaceans to livestock to even humans being eaten after death. Among the scavengers in their range, eagles are often dominant over all but perhaps the largest carnivorous mammals (i.e. gray wolves, etc.) However, this eagle can be a powerful hunter as well. In Scotland, the diet of this species differs significantly from that of sympatric golden eagles, as is also the case in Norway. The daily food requirement for a white-tailed eagle is in range of 500–600 g (1.1–1.3 lb).[page needed] Although generally a less active hunter than the golden eagle, competition over food can go either way depending on the individual eagle. They can exist at higher population densities and typically outnumber golden eagles because of their longer gut and more efficient digestive system, being able to live better with less food.
Virtually any fish found near the surface is potential prey for the white-tailed eagle. Commercial fisheries and carp ponds are readily exploited by the eagles when available. Although, given the opportunity, they occasionally kill and harass some land birds, white-tailed eagles usually target water-based birds as prey. In the Baltic, the diet of this species consists mainly of sea birds (from the little tern to the great skua) and pike. Recently they are reported to have attacked and eaten great cormorants and in some cases destroyed whole colonies. In the Estonian island of Hiiumaa, home to at least 25 pairs of sea eagles, as many as 26 individuals have been observed simultaneously culling a single cormorant colony. In the UK, fulmar are noted as a common prey species and as such may contribute to locally high levels of DDT and PCB chemicals in nesting eagles. Additionally, loons, grebes, ducks, coots, auks, gulls, geese and even swans have been preyed upon. Adults, nestlings and eggs of other birds are all regularly consumed. When preying upon non-nesting birds, white-tailed eagles often fly towards a waterbird repeatedly, forcing it to dive again and again until the bird is exhausted and more easily caught. Very large prey such as swans may be dragged along the surface of the water to the shore to be consumed. Live mammals consumed have ranged in size from voles to lambs and deer calves, the latter likely around the same size as the record-sized deer carried by bald eagles in North America.
White-tailed eagles are sexually mature at four to five years of age. They pair for life, though if one dies replacement can occur quickly. A bond is formed when a permanent home range is chosen. They have a characteristic aerial courtship display which culminates in the pair locking talons mid-air and whirling earthwards in series of spectacular cartwheels. White-tailed eagles are much more vocal than golden eagles, particularly during the breeding season and especially the male when near the eyrie. Calls can sometimes take the form of a duet between the pair.
The nest is a huge edifice of sticks in a tree or on a coastal cliff. Being faithful to their territories, once they breed, nests are often reused, sometimes for decades by successive generations of birds; one nest in Iceland has been in use for over 150 years.[page needed] In Scandinavia, trees have been known to collapse under the weight of enormous, long-established nests.
The territory of the white-tailed eagle ranges between 30 and 70 km2 (12 and 27 sq mi), normally in sheltered coastal locations. Sometimes they are found inland by lakes and along rivers. Territory of white-tailed eagles can overlap with those of the golden eagle but competition between the two species is limited. Golden eagles prefer mountains and moorland, while the white-tailed eagle prefers the coast and the sea. In adulthood, the white-tailed eagle has no natural predators and is thus considered an apex predator.
Mated pairs produce one to three eggs per year, laid two to five days apart in March or April and incubated for 38 days by both parents. Once hatched, chicks are quite tolerant of one another, although the first hatched is often larger and dominates at feeding times. The female does most of the brooding and direct feeding, with the male taking over now and then. Young are able to feed themselves from five to six weeks and they fledge at eleven to twelve weeks, remaining in the vicinity of the nest, dependent on their parents for a further six to ten weeks. The sex of nestlings can be identified using field methods, or using DNA.
Surplus chicks are sometimes removed from nests to use in reintroduction programs in areas where the species has died out. If left in the nest, they often die sooner or later, as with most large eagles. In such programs the birds are raised in boxes on platforms in the tree canopy and fed in such a way that they cannot see the human supplying their food, until they are old enough to fly and thus find their own food.
Near-extinction and recovery in Europe
White-tailed eagles, being apex predators, tend to experience bioaccumulation from environmental pollutants present in their prey; they also suffer intensive persecution by shepherds and gamekeepers who consider them (usually wrongly) a threat to their livestock and gamebirds. During the period 1800-1970, white-tailed eagles in most of Europe underwent dramatic declines and became extinct in many regions of western, central and southern Europe.
A white tailed eagle was shot in the winter of 1857 at Stolford in Bridgwater Bay and subsequently preserved for display. It may be seen at the Somerset Heritage Centre (TA2 6SF). It was presented to the county museum by Miss Bailey, the executrix of the owner's will, in 1881.
While Norway, Germany, Poland and Iceland harboured the largest surviving populations, pockets of reproducing pairs remained in several other countries. Intense conservation actions throughout much of the remaining European distribution range (legal protection to decrease hunting, protection of breeding sites, and winter feeding) led to recovery of many local populations. Since the 1980s, the European white-tailed eagle population has recovered steadily and is spreading back westward. It has today recolonised several traditional breeding areas in Europe. This ongoing recovery is assisted in Scotland and Ireland by reintroduction schemes.[page needed][page needed]
In a recovering population in north-east Germany, a trade-off between the distance to neighbouring breeding pairs and to the nearest water body (the birds' favoured foraging habitat) was found. This indicates that pairs may be increasingly selecting suboptimal habitats to reduce competition as the population increases, and has implications in the management of such populations.
Some threats still remain, notably illegal persecution by gamebird shooting and egg thieves in Scotland. A new threat from wind turbines is emerging with significant mortality (considerably in excess of the area's population productivity) occurring at the Smøla Windfarm in Norway.
White-tailed eagles were successfully reintroduced to the Isle of Rum, in the Small Isles archipelago in Scotland, in 1975 and now breeds throughout the Western Isles and the mainland coast of Wester Ross. It has many Gaelic names, including iolar sùil na grèine or 'eagle of the sun's eye.' In August 2008, fifteen chicks raised in Norway were released at a secret location in Fife, in expectation of reintroducing the species to the east coast of Scotland as well. The white-tailed eagle is still a rare breeder in Britain following its extinction and reintroduction, with 36 pairs in 2006 and 40 in 2008.[page needed]
On 22 May 2006, it was announced that a pair of white-tailed eagles breeding in the Oostvaardersplassen nature reserve in the Netherlands had arrived on their own, not as a reintroduction. This was the first time the bird has bred in the Netherlands in living memory. In 2007, 2008 and 2009 the eagles returned to their nest. In 2010, it turned out that the white-tailed eagle was also breeding in the Zwarte Meer nature district and in the Lauwersmeer area. There is also a confirmed case of breeding white-tailed eagles in the Biesbosch. Currently (2017), there are around ten pairs breeding spread over the country.
The white-tailed eagle is being reintroduced to Ireland, where its Irish name of Iolar Mara (sea eagle) reflects its historic association with the island's long coast. The program was begun in the summer of 2007. Fifteen to twenty young eagles from Norway are being released each spring into the Killarney National Park in the south-west of Ireland. This comprehensive project will last a number of years, with many more eagles being released. The species has a rich history on the island but became extinct in Ireland in the 1900s due to persecution from landowners. The last pair bred on the coast of Mayo in 1912.
In 2007, a hundred local sheep farmers gathered at Kerry airport to protest the eagles' arrival. Irish Farming Association Hill Committee chairman Mr O'Leary said he had no doubt the eagles would take lambs. Since their reintroduction seven eagles have been confirmed poisoned in County Kerry, two suspected of having been poisoned, and one shot. A 13th eagle released in Kerry was shot in Northern Ireland. Twenty more eagles were due for release in 2010. However, Dr Allan Mee, in charge of the sea eagle project, stated "the continuing loss of eagles to poisoning had cast a shadow over the future of the ambitious programme." The first white-tailed eagle breeding pair since 1912 nested 100 years later on Lough Derg (Loch Deirgeirt), marking a great success for the Irish reintroduction programme. In early May 2013, the first eaglets were born in Ireland since the re-introduction programme began; one in the Killarney National Park and two in County Clare. In Spring 2015, five nests hatched chicks in 4 counties in Ireland - Clare, Cork, Galway and Kerry.
Studies of microsatellite and mitochondrial DNA in white-tailed eagles from north-central Europe have shown that the recovering European population has retained appreciable amounts of genetic diversity, implying low risk of inbreeding depression (a serious concern in species with low population density). Therefore, recovery of this formerly endangered species is a true success story for nature conservation. The story also shows how local protection of a species can be successful and important for preserving the species' evolutionary potential.
It is believed to be the White eagle shown in the Polish coat of arms and in the Serbian coat of arms. The sea eagle is often blazoned grasping a fish (usually a pike) in its talons, distinguishing it from an ordinary eagle.
On Orkney, (Scotland), sea eagle bones have been found in 6000-year-old burial mounds, among them the Tomb of the Eagles, suggesting that the birds were revered by the prehistoric people there, a belief strengthened by the Pictish stone carvings of sea eagles from Orkney.
In the Shetland Isles (Scotland), fishermen believed that as soon as a sea eagle appeared fish would rise to the surface, belly up; this led to some fishermen using eagle fat, smeared on their bait, to increase their catch.
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describes plumage differences between Bald Eagle and White-tailed Eagle in juvenile plumage
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|Wikimedia Commons has media related to Haliaeetus albicilla.|
|Wikispecies has information related to: Haliaeetus albicilla|
- White-tailed Eagle Webcam - Smøla, Norway
- White-tailed Eagle at RSPB: Birds by Name
- Live webcam nest White-tailed Eagle, Oostvaardersplassen, Netherlands.
- Fieldguide page on Flickr
- White-tailed Eagles in Scotland. BBC website.
- BirdLife species factsheet for Haliaeetus albicilla
- "Haliaeetus albicilla". Avibase.
- "White-tailed Sea-eagle media". Internet Bird Collection.
- White-tailed eagle photo gallery at VIREO (Drexel University)
- Audio recordings of White-tailed eagle on Xeno-canto.