Eurasian eagle-owl
- Despite its size, the Eurasian eagle owl flies quite fast and in flight is able to catch up with a crow.
- The lifespan of the Eurasian eagle owl in captivity reaches 60 years, which significantly exceeds its lifespan in the wild.
- Characteristic features of the Eurasian eagle owl's appearance include paws covered with down all the way to the claws, and large round eyes with bright orange irises.
- Eurasian eagle owls may lay eggs twice a season, but only when there is an abundance of mice—in exceptional cases.
- The Eurasian eagle owl is known for its distinctive appearance. It is easily recognized by its feathered ears, which are tilted outward.
Age
The Eurasian eagle owl’s typical lifespan ranges from 51 years to 85 years and 1 month, with a maximum recorded lifespan of 68 years and 1 month, and a theoretical lifespan between 47 years and 10 months and 68 years and 4 months. The species reaches sexual maturity from 7 months to 3 years of age. Development begins with the embryo stage, during which the developing young are inside an egg. Following hatching, the chick stage lasts from 1 day to 2 months, during which the young are sheltered, covered in light down, and fed and protected by their parents. The post-fledging juvenile stage then follows, lasting from 2 months to 2 years, as the young bird learns to fly and hunt independently. Finally, the adult stage, when the bird is capable of reproduction, lasts from 2 to 30 years.
Phenotype
The Eurasian eagle owl has soft down for warmth as a chick; young birds have feathers of a brown color with stripes for camouflage, and their rapid growth is notable. Adult individuals possess a strong and sharp beak for tearing food, and two large feather tufts on the head that aid in camouflage and displaying mood. The species’ eyes are large and orange, providing excellent nocturnal vision, and adult plumage is a brown hue with dark stripes, which helps them to hide among rocks and trees. Eurasian eagle owls also have strong claws on their feet for catching and holding prey.
Physiology
The Eurasian eagle owl has a body length ranging from 58 to 75 centimeters, with a wingspan measuring from 1.6 to 1.88 meters and a mass between 2.06 and 2.75 kilograms; the young experience several developmental stages, beginning as an "embryo" with a body length of 5.5 to 6.5 centimeters and a body mass of 55 to 75 grams, progressing to a "nestling" phase characterized by a body length of 10 to 35 centimeters and a body mass of 60 grams to 1.4 kilograms, followed by a “rapid growth juvenile” stage with a body length of 50 to 68 centimeters and a body mass of 1.3 to 2.6 kilograms, and finally reaching adulthood with a body length of 58 to 71 centimeters and a body mass of 1.5 to 2.8 kilograms.
Habitat
The Eurasian eagle owl inhabits land and woodland landscapes, including elevations up to 2 kilometers above sea level. The species occupies temperate mixed forests with warm summers and many oak, birch, and maple trees, flooded meadows where water frequently covers the ground and there is abundant grass, Mediterranean forests with dry and hot summers and warm and rainy winters, and taiga forests characterized by cold winters and numerous coniferous trees such as spruce and pine. The climate varies considerably, encompassing summers with almost no rain, very hot summers exceeding 25 to 30 degrees Celsius, consistently wet conditions with frequent rains and high humidity, summers with plentiful rainfall and cool temperatures, and winters with significant snowfall and cold temperatures.
Shelter
The location is on rocky ledges, in caves, or old nests of other birds. The type of shelter is that there is no permanent shelter. The species does not have a permanent or long-term shelter.
Geography
The Eurasian eagle owl occupies the Palearctic biogeographical region and inhabits several ecosystems, including Celtic broadleaf forests, broadleaf forests of Western Europe, coniferous forests of the Qilian Mountains, Balkan mixed forests, Baltic mixed forests, and European Atlantic mixed forests.
Feeding
The Eurasian eagle owl eats animal food and hunts prey at night using its acute hearing and vision, employing a strategy of active hunting and ambush. Its diet includes rodents, hares, rabbits, small birds, hedgehogs, more hares and rabbits, and other small mammals, with specific prey items such as noble ducks, pigeons, mongooses, grey field voles, and rats. The species obtains food through stalking or silent flight. The daily food requirement ranges from 150 grams to 350 grams.
Reproduction
The Eurasian eagle owl’s embryo develops for 3 weeks and 4 days; the female lays eggs in spring within a shelter on a cliff or an old nest, and the clutch size is 2 to 4 young. Both parents guard and feed the chicks. The species reaches maturity from 2 to 3 years of age and reproduces every 1 year. The brood size is 2 to 4.