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Eurasian eagle-owl

life science Maturity 7-9 Next article →

The Eurasian eagle-owl (Bubo bubo) is a massive bird of prey found across much of Eurasia.

Eurasian eagle-owl (44088)
Eurasian eagle-owl (44088)

It is recognized as one of the largest owl species in the world. While it is smaller than the golden eagle, it is significantly larger than the snowy owl. Some people call it the world's largest owl, though other species like the Blakiston's fish owl are heavier on average.

Eurasian Eagle Owl
Eurasian Eagle Owl

This bird plays a vital role in its ecosystem as a powerful predator. It is widely distributed across many different environments, from mountains to cities.

Physically, the eagle-owl has a very distinct appearance. It possesses prominent ear tufts, which are feathers on the head that can be held upright. Its plumage is highly variable across different subspecies, but it often features mottled blackish and tawny colors. The wings and tail are marked with bars, and the underparts are often a streaked buff color. One of its most striking features is its bright orange eyes.

Eurasian Eagle-Owl - Kazakistan S4E1976 (16099271769)
Eurasian Eagle-Owl - Kazakistan S4E1976 (16099271769)

These eyes help the bird see in low-light conditions. The facial disc, the area around the eyes, is tawny-buff and speckled with dark colors.

The eagle-owl is primarily a nocturnal predator, meaning it hunts during the night. However, its white throat patches suggest it may also be active during low-light hours near sunrise and sunset. Its diet is quite diverse. It predominantly hunts small mammals like rodents and rabbits.

Uhu im Flug
Uhu im Flug

It also consumes birds and larger mammals. Secondary prey items include reptiles, amphibians, fish, and even large insects. To catch this prey, the owl uses its strong, robust feet. Unlike some other raptors that use talons to cause bleeding, owls use their feet to constrict prey to death.

Closing in - geograph.org.uk - 2464900
Closing in - geograph.org.uk - 2464900

Their talons then serve to hold the prey securely.

Reproduction for the Eurasian eagle-owl involves specific nesting habits and parental cooperation. They typically breed in concealed locations like cliff ledges, gullies, or among rocks. The nest is often just a simple scrape in the ground. A female typically lays a clutch of two to four eggs. These eggs are laid at intervals, so they hatch at different times.

The female is responsible for incubation, which is the process of keeping the eggs warm. The male supports the family by bringing food to the female and the growing nestlings. Both parents provide care for the young for approximately five months.

There is significant variation among the at least 12 recognized subspecies of this owl.

White horned owl portrait
White horned owl portrait

Most populations reside in Continental Europe, Scandinavia, Russia, and Central Asia. Russia is likely where the highest numbers and diversity of subspecies occur. In the United Kingdom, the population is much smaller, with an estimated 12 to 40 pairs.

Eurasian Eagle-owl (Bubo bubo) (50024089456)
Eurasian Eagle-owl (Bubo bubo) (50024089456)

While the species is listed as "least concern" by the IUCN, the overall population trend is currently decreasing. The total population is estimated to be between 100,000 and 500,000 individuals.

Scientific measurements show how specialized this bird is for its lifestyle. Females are larger than males, with weights ranging from 1.5 to 3.3 kilograms.

Eurasian eagle-owl (44088)
Eurasian eagle-owl (44088)

The wingspan can reach up to 1.8 meters in some large specimens. Interestingly, they have high wing loading, which means they have a small wing area relative to their body weight. This is different from birds like the barn owl, which have lower wing loading. High wing loading can mean the eagle-owl is less agile in flight than smaller owls. However, their large size and strength make them formidable hunters.

The eagle-owl's biology is also tied to how it perceives the world. They have relatively large ear openings, which are often asymmetrical. This asymmetry, where one ear is positioned differently than the other, helps with sound localization.

Bubo bubo04
Bubo bubo04

However, their facial discs are shallower than those of barn owls. This indicates that while they use sound, they rely more heavily on sight for hunting. This combination of physical traits allows them to occupy a wide variety of habitats, from remote steppes to urban parks.

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🖼️ Images & Media (26)
File:Eurasian eagle-owl (44088).jpg
Eurasian eagle-owl (44088).jpg
File:Eurasian eagle owl and handler arp.jpg
Eurasian eagle owl and handler arp.jpg
File:Closing in - geograph.org.uk - 2464900.jpg
Closing in - geograph.org.uk - 2464900.jpg
File:Bubo bubo04.jpg
Bubo bubo04.jpg
File:Eurasian Eagle Owl.jpg
Eurasian Eagle Owl.jpg
File:Bubo bubo sibiricus - 01.JPG
Bubo bubo sibiricus - 01.JPG
File:White horned owl portrait.jpg
White horned owl portrait.jpg
File:Western Siberian eagle-owl in flight.jpg
Western Siberian eagle-owl in flight.jpg
File:Eurasian Eagle-Owl - Kazakistan S4E1976 (16099271769).jpg
Eurasian Eagle-Owl - Kazakistan S4E1976...
File:Tierpark Berlin, Bubo bubo omissus, 252-357.JPG
Tierpark Berlin, Bubo bubo omissus, 252-357.JPG
File:Eurasian Eagle-owl (Bubo bubo) (50024089456).jpg
Eurasian Eagle-owl (Bubo bubo) (50024089456).jpg
File:Bubo bubo 4.jpg
Bubo bubo 4.jpg

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