Overview
The White-tailed Eagle (Haliaeetus albicilla), celebrated across Europe as the Sea Eagle, Ern, or White-tailed Sea Eagle, is the largest bird of prey in Europe and the fourth largest eagle in the world. Dominating the wild coastal fjords, island archipelagos, and vast freshwater river deltas of Eurasia, this magnificent apex raptor cuts an unforgettable figure in flight, often dubbed the ‘flying barn door’ due to its colossal, broad-planked rectangular wings.
Possessing a formidable bone-yellow hooked bill, pale silver-cream head, and brilliant wedge-shaped white tail in adulthood, Haliaeetus albicilla is a legendary symbol of wilderness and sovereignty. Serving as a crucial apex predator and scavenger of aquatic ecosystems, the sea eagle maintains the health of fish stocks and waterbird colonies across temperate and subarctic waterways.
AT A GLANCE
- Common Name: White-tailed Eagle
- Scientific Name: Haliaeetus albicilla
- Category: Birds
- Subcategory: Birds of Prey
- Size: 70 to 92 cm (28 to 36 in) length; immense wingspan of 190 to 245 cm (75 to 96 in)
- Weight: 3.1 to 6.9 kg (6.8 to 15.2 lb); females up to 30% heavier than males
- Lifespan: 20 to 25 years in the wild; maximum recorded in the wild over 33 years
- Diet: Carnivorous/Apex Raptor: marine and freshwater fish (pike, carp, cod, salmon), waterfowl (ducks, geese, grebes, coots), seabirds, lagomorphs, and carrion
- Habitat: Marine coastal cliffs, deep fjords, island archipelagos, freshwater lakes, large river deltas, and flooded wetlands surrounded by mature forests.
- Range: Widespread across northern, eastern, and central Eurasia, from Greenland and Iceland east through Scandinavia, Russia, and central Europe to the Pacific coasts of Siberia and Japan.
- Conservation Status: Least Concern (IUCN Red List)
Biology and Physical Characteristics
Haliaeetus albicilla is an imposing raptor with a heavy, barrel-chested body and exceptionally broad, fingered wings that provide enormous aerodynamic lift. Its plumage is predominantly dark earth-brown, gradually lightening with age over the head, neck, and upper mantle into a pale ash-grey or cream. The short, wedge-shaped tail becomes pure, immaculate white only after the bird reaches full adult maturity at five to six years of age.
Its massive bill is deep, heavily arched, and brilliant chrome-yellow, backed by a piercing pale-yellow iris. Its powerful yellow feet are bare of feathers on the lower tarsus (unlike ‘booted’ eagles like the Golden Eagle), featuring rough, spiny pads called spicules on the undersides of the toes and colossal, curved black talons that lock together with hydraulic force, perfectly engineered to grip slippery, thrashing salmon and pike.
Behavior and Ecology
White-tailed eagles are master soaring predators that utilize coastal updrafts and thermal air currents to patrol vast territories of up to 70 square kilometers. When hunting fish, the eagle glides low over the water surface before swinging its massive legs forward to snatch fish from the surface with barely a splash. It is also an accomplished kleptoparasite, regularly bullying ospreys, cormorants, and otters into abandoning their hard-won prey.
Mated pairs mate for life and maintain continuous bonds through breathtaking aerial courtship displays, locking talons in mid-air and cartwheeling in death-defying freefalls before separating yards above the waves. They build colossal eyries of sticks in ancient pine trees or on inaccessible coastal cliffs, adding material year after year until the nest weighs over a ton. The female lays two chalky-white eggs in early spring, which both parents incubate for 38 days.
Conservation and Human Impact
The White-tailed Eagle is classified as Least Concern on the IUCN Red List, having staged one of the most triumphant wildlife recoveries in European conservation history. Driven to the brink of continental extinction by the mid-20th century due to heavy human persecution and eggshell-thinning caused by DDT and PCB contamination, the species has made a spectacular comeback following bans on organochlorines and strict legal protection.
Highly successful reintroduction programs in Scotland, Ireland, and the Isle of Wight have restored the sea eagle to historic British skies after a century of absence. Current ongoing threats include lead ammunition poisoning from ingested game carcasses, collisions with wind turbine blades in coastal wind farms, and illegal poisoning on private hunting estates.
Interesting Factoid
White-tailed eagles mate for life and perform a heart-stopping aerial courtship display where the pair lock talons in mid-air and cartwheel in a spinning freefall toward the ground before releasing at the last second.