Aquila chrysaetos
Golden eagles are fairly long-living birds in natural conditions. The survival rate of raptorial birds tends to increase with larger body size, with a 30–50% annual loss of population rate in small falcons/accipiters, a 15–25% loss of population rate in medium-sized hawks (e.g., "Buteo"s or kites) and a 5% or less rate of loss in eagles and vultures. The oldest known wild golden eagle was a bird banded in Sweden which was recovered 32 years later. The longest-lived known wild golden eagle in North America was 31 years and 8 months. The longest-lived known captive golden eagle, a specimen in Europe, survived to 46 years of age. The estimated adult annual survival rate on the Isle of Skye in Scotland is around 97.5%. When this extrapolated into an estimated lifespan this results in 39 and half years as the average for adult golden eagles in this area, which is probably far too high an estimate. Survival rates are usually much lower in juvenile eagles than in adult eagles. In the western Rocky Mountains, 50% of golden eagles banded in the nest died by the time they were 2 and a half years and an estimated 75% died by the time they were 5 years old. Near a wind turbine facility in west-central California, estimated survival rates, based on conventional telemetry of 257 individuals, were 84% for first-year eagles, 79% for 1- to 3-year-olds and adult floaters and 91% for breeders; with no difference in survival rates between sexes. Survival rates may be lower for migrating populations of golden eagles. A 19–34% survival rate was estimated for juvenile eagles from Denali National Park in their first 11 months. The average life expectancy of golden eagles in Germany is 13 years, extrapolated from a reported mere 92.5% survival rate.