GOLDEN EAGLE

The Golden Eagle in Somiedo

The golden eagle (Aquila chrysaetos) is the most imposing diurnal raptor of Somiedo Natural Park and undisputed master of the Cantabrian skies. With a wingspan that can exceed 2 metres, this aerial giant presides over the cliffs and high summits of the park, where it nests and hunts with unrivalled mastery. Watching a golden eagle soaring on thermals above the valleys of Somiedo is one of the most memorable natural experiences the park has to offer.

Characteristics of the Golden Eagle

The golden eagle is one of the largest birds of prey in the world. Adults have a wingspan of 180 to 234 cm and weigh between 3 and 6.5 kg, with females noticeably larger and heavier than males. Adult plumage is dark brown with a golden-ochre nape and crown, giving the bird its common name. Juvenile birds display white patches on their wings and at the base of the tail, features that gradually disappear until full adult plumage is attained at five or six years of age. Its hooked beak, powerful talons and acute vision — up to eight times sharper than a human's — make it an extraordinary hunter.

Habitat and Territory in Somiedo

In Somiedo Natural Park, the golden eagle occupies a territory of 50 to 200 km² per breeding pair. It favours open mountain landscapes with rocky outcrops for nesting, combined with extensive grassland and scrubland for hunting. The quartzite and slate crags that abound in Somiedo — especially around the Puerto de Somiedo area, the slopes overlooking Valle del Lago and the most rugged zones of the park — are ideal nesting sites. The golden eagle is highly faithful to its territory: the same pair may use the same cliff site for decades.

Nesting and Reproduction

The golden eagle is monogamous and forms stable, lifelong pair bonds. The breeding season begins very early in the Cantabrian Mountains: nest repairs and courtship flights start in January and February, and egg-laying takes place between February and March. Each pair maintains several alternative nests — called eyries — which they use in successive years. Nests are large structures of branches that can reach 1.5 m in diameter and more than 1 m in depth after years of use and enlargement. The usual clutch is 1 or 2 eggs, although both chicks rarely survive due to the phenomenon of Cainism: the elder chick usually eliminates the younger in the first days of life. The incubation period is 43–45 days, and the fledglings remain in the nest for 65–80 days.

Diet

The golden eagle is a generalist predator that adapts its diet to prey availability. In Somiedo its menu includes mainly rabbits (Oryctolagus cuniculus), hares (Lepus granatensis), young chamois, foxes and medium to large birds such as partridges, pigeons and corvids. It also consumes carrion when the opportunity arises, especially in winter. It hunts by soaring high above its territory until it spots prey, then performing a rapid dive — reaching speeds of up to 240 km/h — to seize it with its powerful talons.

Conservation Status

The golden eagle is classified as Least Concern globally, but breeding populations in the Cantabrian Mountains are relatively scarce. In Asturias, between 20 and 30 breeding pairs are estimated, with a stable presence in Somiedo Natural Park. The species is fully protected under Spanish and European law. Its main threats include electrocution on power lines, disturbance at nests during the breeding season, reduction of prey through habitat loss, and illegal poisoning. The golden eagle's nesting area in Somiedo is kept away from the main tourist circuits to guarantee its tranquillity.

Where and When to Spot the Golden Eagle in Somiedo?

The golden eagle is visible throughout the year in Somiedo, although the best sightings occur in winter and spring, when leafless trees and clear skies provide optimal visibility. The best observation points are elevated areas with wide panoramas: the Mirador del Puertu, the surroundings of the Lagos de Somiedo and the mountain passes. Peak activity is in the early morning and late afternoon, when it exploits thermal updrafts to soar effortlessly. Binoculars of at least 8×42 or a spotting scope are recommended to identify it clearly at distance.