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The bald eagle (Haliaeetus leucocephalus) has been the national bird of the United States since 1782. Once a federal- and state-endangered species, due to hunting and use of pesticides, the bald eagle has recovered under protection.
Bald eagles are larger than most raptors. In flight, the bald eagle holds its large broad wings flat. Species that look similar include the turkey vulture and osprey, but distinct differences are present.
Bald eagles nested in Indiana until the 1890s, and small numbers wintered in the state from November through March. Bald eagles are found mostly along major rivers and other large bodies of water. Mid-winter bald eagle surveys conducted since 1979 have shown a dramatic increase in wintering eagles in the state.
In 1985, the Indiana Nongame and Endangered Wildlife Program began the Bald Eagle Reintroduction Program. Seventy-three eaglets (seven to eight weeks old) were obtained from Wisconsin and Alaska from 1985 through 1989 and brought to Indiana. They were placed in a 25-foot nest tower in a secluded bay on Lake Monroe. The birds were monitored and fed daily until they were old enough to fly at 11 to 12 weeks of age. Since then, the eagle population has continued to expand. In 2016, there were an estimated 300 nesting territories in Indiana. You can find more information on bald eagle abundance and research in our annual Wildlife Science Report.
Bald Eagles typically nest in forested areas near water, avoiding heavily developed areas when possible. For perching, they prefer tall, mature trees that give a wide view of the surrounding area. In winter, they may be found in dry, open uplands if open water is near for fishing.
Their huge nests—the largest nests of any North American bird—are typically 5-6 feet wide and 2 feet deep. Wintering eagles prefer mature trees along large, open bodies of water for daytime perches. At night, large trees in sheltered valleys and ravines are preferred for roosting, and it is common for eagles to roost in small groups during winter.
Young eagles leave the nest or “fledge” at 11 to 12 weeks old. Adult eagles do not begin to nest until they are 4 or 5 years old. Eagles mate for life and return each year to the same location to nest and breed, selecting nest sites close to where they were raised as young.
Bald eagles have a 35-day incubation period and will leave the nest at about 10 weeks old.
The primary diet for bald eagles is fish, which are taken near the water’s surface. Fish are usually carried to a tree or perch and consumed. Eagles also take waterfowl, rabbits, squirrels and other small mammals. Most eagles consume animals weighing up to one pound. Eagles have excellent eyesight and can locate prey up to 2 miles away.
The bald eagle project was the first endangered species restoration project initiated by Wildlife Diversity staff, in what was then called the Indiana Nongame and Endangered Wildlife Program.
Between 1985 and 1989, 73 bald eagle chicks were released at Monroe Lake in Monroe County.
Upon reaching adulthood at 4-5 years old, bald eagles return to within 50-100 miles of where they fledged. The purpose of returning is to nest.
Indiana's first successful bald eagle nests in this century occurred in 1991 at Monroe Lake and Cagles Mill Lake. The state's last successful nest before then was in 1897. Loss of habitat and decreased reproduction due to pesticides, such as DDT, contributed to the bald eagle's disappearance from Indiana.
Bald eagle nesting was monitored and the young eagles were banded with leg identification tags to help track their movements. The number of nesting territories continued to increase.
By 1998, there were nests on rivers and lakes from Tippecanoe County south to Posey County and east to Brown County. Bald eagles continued to do so well that they were delisted from state-endangered to a species of special concern in 2008, and comprehensive surveys were discontinued after 2010. In 2016, there were an estimated 300 eagle nesting territories in Indiana.
In 2015, winter surveys were also conducted as another way to monitor long-term eagle population trends in the region. The National Midwinter Bald Eagle Survey, coordinated by the U.S. Army Corps of Engineers, has been conducted in Indiana since 1979. This year, eagles were surveyed from the ground at 11 locations, mainly Division of Fish & Wildlife properties or public lakes. Surveys were also taken by helicopter at four survey routes along rivers that are typically inaccessible by foot. The number of bald eagles tallied at these sites was 243 individuals, which is 40 percent above the previous 10-year average of 174 eagles. At 10 sites surveyed from the ground in the past two years, 167 eagles were counted compared to 147 in 2014.
A remarkable story comes from one of the 73 eaglets first brought to Indiana. Bald eagle #C43 was spotted by Cassie Hudson, assistant nongame mammal biologist, and friends as they were on a boat ride in late May 2015.
Photos were taken by Teresa Bass and shared with Amy Kearns, the assistant nongame bird biologist, and retired nongame bird biologist John Castrale, who identified the bird as C43. Records state that C43 was removed from a nest in Whitestone Harbor, Alaska, on July 22, 1988, making her 27 years old, arguably one of the oldest bald eagles in Indiana. Photos also revealed that she had a brood patch. This indicates she is still raising young. C43 is a powerful reminder of the tireless and determined effort to recover this species, and a symbol of hope for our state’s endangered species.
|Year||Nesting Territories||Attempts||Successful Nests||23 Young Fledged|
|2010||120||98||Last comprehensive eagle survey|