How long do bald eagles live in the wild? Eagle Life Cycle
Bald Eagle (Haliaeetus leucocephalus)
Bald eagles live in the wild Eagle
How long do bald eagles live? The bald eagle is a North American species. It once lived from Alaska and Canada down to northern Mexico. Now, it is a success story under the Endangered Species Act. Forty years ago, our national symbol was in danger of extinction throughout most of its range. Habitat loss, illegal shooting, and DDT contamination harmed the eagle population. The federal government banned DDT and similar pesticides. The Endangered Species Act protects its habitat. The American public has helped bald eagles recover through their conservation efforts.
Bald eagles are strong, brown birds with a white head and tail. They can weigh up to 14 pounds and have a wingspan of 8 feet.
Male eagles are smaller, weighing as much as 10 pounds and having a wingspan of 6 feet. Bald eagles can be confused with golden eagles. They are mostly dark brown until they are four to five years old. Then, they get their distinctive coloring. There is a distinction between the two species, though, even during the early years. Only the tops of the bald eagle’s legs have feathers. The legs of golden eagles are feathered all the way down. Bald eagles live near rivers, lakes, and marshes where they can find fish, their staple food. Bald eagles are growing in number. So, they are spreading out more. They are even nesting in cities now. Bald eagles eat waterfowl, turtles, rabbits, snakes, and other small animals. They also feed on carrion. Bald eagles require a good food base, perching areas, and nesting sites. Their habitat includes estuaries, large lakes, reservoirs, rivers, and some seacoasts. In winter, birds gather near open water. They perch in tall trees to spot prey and find shelter at night. Bald eagles often build nests at the top of big trees. They usually return each year to use and expand them. Nests can be found in many places. They are on cliffs, the ground, and even on cell phone towers. Nests may reach 10 feet across and weigh a half ton. Bald eagles might have one or more alternate nests in their breeding area. Birds fly far but often come back to breed within 100 miles of where they grew up. Bald eagles may live 15 to 25 years in the wild, longer in captivity. Breeding bald eagles typically lay one to three eggs once a year, and they hatch after about 35 days. The young eagles are flying within three months and are on their own about a month later. However, disease, lack of food, bad weather, or human interference can kill many eaglets. Recent studies show that approximately 70 percent survive their first year of life.
The Bald Eagle's Challenge
When America chose the bald eagle as its national symbol in 1782, around 100,000 eagles nested across the country.
The species likely began to decline in the mid to late 1800s. This coincided with a drop in waterfowl, shorebirds, and other prey.
Bald eagles primarily feed on fish and carrion. But they were once seen as thieves that attacked chickens, lambs, and farm animals. So, the large raptors were shot to cut a perceived threat. Coupled with the loss of nesting habitat, bald eagle populations declined. In 1940, Congress saw that the Bald Eagle was “threatened with extinction.” So, they passed the Bald Eagle Protection Act. This law banned killing, selling, or owning the eagle. A 1962 amendment added the golden eagle, and the law became the Bald and Golden Eagle Protection Act. After World War II, scientists praised DDT. They saw it as a new pesticide to control mosquitoes and other insects. DDT and its residues washed into nearby waterways. Aquatic plants and fish absorbed the chemicals. Bald eagles poisoned themselves with DDT when they ate the contaminated fish. The chemical interfered with the ability of the birds to produce strong eggshells.
Their eggs had very thin shells. This often caused them to break during incubation or not hatch at all.
DDT also affected other species, such as peregrine falcons and brown pelicans. Some pesticides linked to DDT may also increase death rates. They can harm reproduction, too. By 1963, with only 417 nesting pairs of bald eagles known to exist, the species was in danger of extinction.
Eagle Life Cycle
The Road Back
Once people realized DDT was dangerous, the Environmental Protection Agency acted. This awareness grew, especially after Rachel Carson’s 1962 book, Silent Spring.
They banned DDT and some related pesticides in the United States.
That was in 1972, and it was the first step on the road to recovery for the bald eagle. In 1967, the Secretary of the Interior labeled bald eagles below the 40th parallel as endangered. This was done under the Endangered Species Preservation Act of 1966. The Service listed the species as endangered in 1978, after the Endangered Species Act passed in 1973. This was true for most of the lower 48 states. However, in Michigan, Minnesota, Oregon, Washington, and Wisconsin, it was labeled as threatened. The species isn't listed as threatened or endangered in Hawaii since it doesn't exist there. It also isn't listed in Alaska because the populations are strong. Listing the species as endangered helped the Service and its partners act faster.
They focused on:
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Captive breeding
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Reintroduction efforts
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Law enforcement
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Protecting nests during the breeding season
Population Milestones In July 1995, the Service said that bald eagle numbers in the lower 48 states had recovered.
They could now move from endangered to the less critical category of threatened. In 2007, the Service found at least 9,789 nesting pairs of bald eagles in the contiguous United States. On June 28, 2007, the Service announced our nation's symbol had recovered. They removed it from the list of threatened and endangered species.
Population Growth In 2016, the Service released a report on bald eagle numbers.
This was part of a Programmatic Environmental Impact Statement.
The report from 2009 estimated the bald eagle population in the lower 48 states to be 72,434. This number includes 30,548 breeding pairs. In 2021, the Service released a technical update. It gave the latest estimates for the bald eagle population in the lower 48 states for 2018-2019. The total was 316,700 eagles, including 71,467 breeding pairs.
What Lies Ahead: The bald eagle's recovery is a famous success story in conservation.
The Service partners with state and federal agencies, tribes, NGOs, and private landowners. This teamwork helps our nation’s symbol thrive. The Service removed the bald eagle from the list of endangered species. But it still has protection. The Migratory Bird Treaty Act and the Bald and Golden Eagle Protection Act keep the bird safe. Both laws prohibit killing, selling or otherwise harming eagles, their nests, or eggs. The Service created guidelines for landowners. These guidelines help them avoid disturbing eagles and promote good conservation practices.
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