The bald eagle (Haliaeetus leucocephalus) lives an average of 20 to 30 years. According to the Philadelphia Zoo, the oldest bald eagle known lived to be 47 years old. That was a captive bald eagle. However, in the wild, bald eagles do not often live out their full lifespan as they face many threats.

Banded wild bald eagles usually die before they turn 30, but a 31-year-old banded female corpse was discovered in Wisconsin on May 16, 2008 (see Resources).

According to the American Bald Eagle Foundation, fewer than 10 percent of bald eaglets survive until sexual maturity. Most bald eagles die in their first year of life, usually from starvation.

Bald eagles do not reach sexual maturity until they are about four or five years old. It is at this stage that they get their characteristic all-white heads.

Adult bald eagles are often killed by colliding with moving vehicles, getting killed by other eagles or being electrocuted by power lines.

Bald eagles eggs are targeted by crows, ravens, gulls and squirrels. Although a protected species, they are still shot and poisoned by people.