Tuesday, Sep 2, 2014

European Eagle Owls aka Eurasian Eagle Owls

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Eurasian Eagle Owl


Eurasian Eagle OwlOverview ... Alternate (Global) Names

Distribution / Range ... Subspecies, Ranges and ID

Description ... Breeding / Nesting ... Diet / Feeding

Calls / Vocalizations ... Lifespan


Overview

The Eurasian Eagle Owls (Bubo bubo) are horned owls found in much of Europe and Asia, where they occur in the mountains and forests with cliffs and rocky areas. They are usually most active at dawn and dusk.

They are known by a variety of names, including Common Great Owls, Northern Eagle Owls, Desert Eagle Owls, Great Eagle Owls or Northern Eagle Owls.

Please note: Most of the images on this page are courtesy of Ian Berwick. www.twinmoorview.com

Eagle Owls are considered to be the world's largest owl species; they weigh about twice as much as the heaviest North American owl - the Snowy Owl, and weigh nine times as much as the common Barn Owl.

They are well known for their power and aggressiveness. They are able to attack and defeat even the large Peregrine Falcons; and they can overpower most birds of prey, except the Golden Eagles.

They have been compared to Golden Eagles in their aggressiveness and hunting style. Like other owls, they have excellent hearing and night vision.

Despite their large range, these owls are not common and can be considered rare and even locally endangered. They are trapped extensively, are at risk of shooting, and are also impacted by loss of habitat due to deforestation.

In the wild, they live for around 20 years; captive birds can live up to 60 years. Because of their size and nocturnal habits, adults have very few natural predators and early death is usually caused by electrocution, traffic accidents and shooting.

Eurasian Eagle Owl (Bubo bubo) - Juvenile


Eurasian Eagle Owl mouthAlternate (Global) Names

Albanian: Bufi ... Arabic: البومة النسارية, البوهة, البوهة بومة أم قرون, بومة نسّارية ... Basque: Duc, Hontza handi, Hontza handia ... Belarusian: Пугач, Філін ... Bulgarian: Бухал ... Catalan: Duc, Gran duc ... Chinese: [diao-xiao], [hen hu], [jiao-chi], [jiu yu-xiao], [jiu-tu-niao], [lao-tu] ... Cornish: Erula, Oula bras ... Croatian: Sova ušara, Sovuljaga buljina, Ušara ... Czech: Výr, Výr velký ... Dutch: Oehoe ... Danish: Stor hornugle ... Estonian: Kassikakk ... Finnish: Huuhkaja ... French: Chouette grand duc, Grand-duc d'Europe, Hibou grand-duc ... Frisian: Oehoe ... German: Uhu ... Greek: (Κοινός) Μπούφος, Μπούφος ... Hebrew: אוח ... Hindi: Komban kottaan ... Hungarian: Uhu ... Icelandic: Úfur ... Irish: Rí-ulchabhán ... Italian: Gufo reale, Gufo reale eurasiatico ... Japanese: sabakuwashimimizuku, washimimizuku, Washi-mimizuku, Washi-mimi-zuku ... Korean: 수리부엉이 ... Macedonian: Голем (Голем ушест) був, Голем був ... Mongolian: Шар шувуу ... Maltese: Kokka Imperjali ... Northern Sami: Bealljeskuolfi, Bumbbástat, Lidnu ... Norwegian: Bergugle, Hubro, Steinulv Polish: puchacz, Puchacz zwyczajny, sowa śnieżna, Syczek ... Portuguese: bufo real, Bufo-real ... Romansh: piv, piv grond ... Romanian: Bufniţă ... Russian: Filin, евроазиатский, Обыкновенный филин, Филин, Филин обыкновенный, Филин северный ... Sardinian: Cuccu, cuccumeu ... Scots: Cailleach-oidhche mhòr ... Slovak: Výr skalný ... Slovenian: velika uharica ... Serbian: buljina, velika ušara, Velika ušara, buljina, Булјина, Буљина, Велика ушара ... Spanish: Buho real, Búho Real ... Swedish: Berguv ... Turkmen: puhu ... Turkish: Puhu ... Tuvinian: Кызыл үгү, Үгү, Ыйбааңгы ... Ukrainian: Пугач ... Welsh: Tylluan eryraidd, Tylluan fawr

Eurasian Eagle Owl


Eurasian Eagle Owl (Bubo bubo) Distribution / Range

The non-migratory Eagle Owls are found across Northern Europe, Northern Africa, through the Middle East, Russia and Asia as far as China, Korea and Japan.

They are generally absent from Britain and Ireland, but small numbers are now starting to breed in Britain.

These adaptable owls inhabit areas with many rocks, cliffs, ravines and open spaces with scattered trees, coniferous forests, deserts and semi-deserts; as well as taiga, wooded steppe and farmland with suitable rocky areas.

In recent history, they have also moved into urban habitats, breeding in quarries and buildings.

They can be found at elevations of up to about 6,500 feet (2,000 meters) in Europe and 14,700 feet (~4,500 meters) in Central Asia and the Himalayas.

Eurasian Eagle Owls are native to the following countries:

Afghanistan; Albania; Andorra; Armenia; Austria; Azerbaijan; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; China; Croatia; Czech Republic; Denmark; Estonia; Finland; France; Georgia; Germany; Greece; Hong Kong; Hungary; India; Iran, Islamic Republic of; Iraq; Israel; Italy; Japan; Kazakhstan; Korea, Democratic People's Republic of; Korea, Republic of; Kyrgyzstan; Latvia; Lebanon; Liechtenstein; Lithuania; Luxembourg; Macedonia, the former Yugoslav Republic of; Moldova; Mongolia; Montenegro; Netherlands; Norway; Pakistan; Palestinian Territory, Occupied; Poland; Portugal; Romania; Russian Federation; Russian Federation; Russian Federation; Serbia; Slovakia; Slovenia; Spain; Sweden; Switzerland; Syrian Arab Republic; Tajikistan; Turkey; Ukraine; Uzbekistan

They are vagrants to ...

Bahrain; Gibraltar

Range of Eurasian Eagle Owl


Eurasian Eagle Owl - turning its headSubspecies and Ranges

  • Bubo bubo bubo (Linnaeus, 1758) - Nominate Form
    • Range: Europe from northern Spain and Scandinavia east to wesern Russia east to about Gor’kiy
  • Bubo bubo ruthenus (Buturlin and Zhitkov, 1906)
    • Central European Russia east to foothills of Ural Mountains, south to lower Volga basin
  • Bubo bubo interpositus (Rothschild and Hartert, 1910)
    • Range extends from Romania and southern Ukraine east to Volga delta, south to Middle East (south to central Israel and Jordan) and northwestern Iran
  • Bubo bubo sibiricus (Gloger, 1833)
    • Range extends from the western foothills of Urals east to Ob river, south to the Ob River, south to west Altai
  • Bubo bubo yenisseensis (Buturlin, 1911)
    • Range: Central Siberia from Ob River to R Ob to Lake Baikal, south to Altai and northern Mongolia
  • Bubo bubo turcomanus (Eversmann, 1835)
    • Inhabits the steppes between lower Volga and Ural Rivers, east to Transbaikalia and south to Kazakhstan, extreme northwestern China (Tarim Basin in northwestern Xinjiang) and western Mongolia




  • Eurasian Eagle Owl (Bubo bubo) Bubo bubo omissus (Dementiev, 1932)
    • Range: Turkmeniya to western China, the Chinese Turkestan
  • Bubo bubo hemachalana Hume, 1873
    • Range: Pamirs and northern Tien Shan south to the Himalayas
  • Bubo bubo nikolskii (Zarudny, 1905)
    • Range: Eastern Iraq and Iran, Afghanistan and northern and western Pakistan
  • Bubo bubo jakutensis (Buturlin, 1908)
    • Range: Northeastern Siberia
  • Bubo bubo ussuriensis (Poljakov, 1915)
    • Range: Southeastern Siberia to northeastern China, Sakhalin, northern Hokkaido and southern Kuril Islands.
  • Bubo bubo kiautschensis (Reichenow, 1903)
    • Range: From western and central China (south to Yunnan and Sichuan) east to Korea
  • Bubo bubo swinhoei (Hartert, 1913)
    • Range: Southeastern China
  • Bubo bubo hispanus (Rothschild and Hartert, 1910) - believed to be extinct
    • Range: Iberian Peninsula. Formerly also occured in the Atlas Mountains in northwestern Africa

Eurasian Eagle Owl


Eurasian Eagle Owl: Note the nictitating membrane - a transparent or translucent third eyelidDescription

The Eurasian Eagle owl (Bubo bubo) is arguably the heaviest owl in the world; followed by the equal-sized or slightly smaller Blakiston's Fish Owl. The Eagle Owl is smaller than the Golden Eagle, but nearly twice the size of the Snowy Owl. Its wingspan reaches up to 7 feet ( 2.1 meters). Its weight can go up to 10 lbs (4.5 kg); compared to the common Barn Owl, which weighs about 1.1 lbs (0.5 kg).

Weight:

Females are generally larger than the males, weighing between 3.9 - 10 lbs (1.75 - 4.5 kg); while the male weighs between 3.3 - 7 lbs (1.5 - 3.2 kg).

Length:

The female stands about 2.5 feet (0.8 meters) tall, and the male about 2 feet (0.6 meters).

Wingspan:

The female's wingspan is between 6 - 7 feet (1.8 - 2.1 meters) and the male's is between 5 - 6 feet (1.5 - 1.8 meters).

Eurasian Eagle Owl Feet These owls have barrel-shaped bodies, large eyes and prominent ear tufts that are usually not raised upright. The upper plumage is brown to black and yellowish brown; the throat is white. On the back there are dark patches. There is a striping pattern on the back and sides of the neck; and dense freckling on the head and forehead. The outer portion of the flat, greyish facial disc is framed with black-brown spotting. The dark tail has blackish brown barring.

There are also slight variations in the plumage and sizes in the different subspecies. The bill and the claws are black.

The legs and toes are fully feathered buffy-white.

The color of their eyes ranges between a brilliant orange-yellow to a deep orange (depending on the subspecies).


Owl Eyes / Vision Adaptations


Eurasian Eagle Owls

Gender ID: Males and females look alike; except the female is considerably larger and the ear tufts of males tend to be more upright than those of females. Hers are usually drooping down.

Juveniles have rudimentary ear-tufts, a narrowly barred under plumage and a buffy down on the head.

Flight: Their flight is powerful and direct, usually consisting of shallow wing beats and long glides. They also have been known to soar on updrafts; and their fast flights are somewhat reminiscent of that of the Buzzard

Similar Species:

Eagle Owls resemble the Great Horned Owl, but are much larger in size.


Eurasian Eagle Owl - SleepyBreeding / Nesting

Eurasian Eagle Owls typically breed from the end of February to the end of April. They are considered to be monogamous, but some cases of bigamy have been recorded.

They usually nest on cliff ledges, in cracks between rocks and in caves, and - to a lesser extent - may also take over the old nest of another species (such as storks or birds of prey). These resourceful birds have also been known to occasionally nest in tree cavities or on the ground. They may re-use the same nest site over several years.

The average clutch consists of 1 -5 , possibly 6 white eggs; the number of eggs largely depends on the amount of food that is available at the time. The eggs measure 2.2 - 2.9" x 1.7 - 2.1" (56 - 73mm x 44.2 - 53mm) and weigh from 2.6 to 2.8 oz (75 - 80 g). The eggs are normally laid at 3-day intervals.

The female alone incubates these eggs alone for 31 - 36 days, while the male feeds the brooding female. After hatching, the female continues to brood the chicks for two weeks, while the male hunts and brings food to the nest for the female to feed to the young. The nestlings leave the nest when they are about 5 weeks old and take their first flight 2 - 3 weeks later. They remain dependent on the parents for another 3 - 4 months.

At about seven to eight weeks, the chicks are ready to fly, but still require food from the parents for several weeks after that. In Europe, the young become independent between September and November, at which time they leave the parents' territory.

The young reach maturity when they are about 1 year old, but usually don't breed until they are 2 -3 years old.


Eurasian Eagle Owl Vocal Patch can be seen when callingDiet / Feeding

Eurasian Eagle Owls mostly feed on small to medium-sized mammals weighing 0.4 - 4.4 lbs (200 - 2,000 grams) - favoring rabbits and hares; but they will also take prey up to the size of foxes and even young deer up to 37 lbs (17 kg) . They also hunt other birds (including smaller owls), up to the size of herons and other birds of prey, such as buzzards. They may also eat amphibians, reptiles (including snakes), fish and insects.

They hunt during dusk and dawn, catching their prey from an open perch on the ground or in flight; they also search rock crevices for roosting or nesting birds. They may even plunge into water to catch fish.


Calls / Vocalizations

The male's call is a deep resonant “oooh-hu” with emphasis on the first syllable.

The female's call is more high-pitched uh-Hu.

Other vocalizations include quiet, guttural chuckling and the female's bark-like scream.

During the breeding season, the females sometimes make a coarse “kraaah” sound. The young also make this sound.

The different members of a group can be identified by their different vocalizations.


Lifespan

The Eurasian Eagle Owls may live up to 21 years or more in the wild. The longest reported age in captivity is 60 years.

Species Research by Sibylle Johnson

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