Home > Ed. Web > Special Features > Bald Eagles
Bald Eagles
 A bald eagle visits DRBC's property in September 2016. Phoot by DRBC.

Despite objections from Benjamin Franklin, the bald eagle (Haliaeetus leucocephalus) was selected as our national emblem on June 20, 1782, because of its long life, great strength, and majestic looks. It is estimated that our national bald eagle population was about 100,000 during the 1700s.

The first major decline in population occurred during the late 1800s. Large numbers of the birds were killed indiscriminately prior to federal protection under the Bald Eagle Act of 1940. The heavy use of DDT and other pesticides, which became widespread by the 1940s, also had a significant effect on the bald eagle population because these chemicals inhibited successful reproduction by making the shells of the eagle eggs too thin to hatch.

By the 1960s a single bald eagle sighting along the Delaware River was rare; this is particularly noteworthy since hundreds of bald eagles previously wintered along the river. Bald eagles are predominantly fish eaters, which is why they build their nests and live near water, and why they migrate to open water areas during the winter months.

Today, the number of bald eagles found nationally and in the Delaware River Basin has rebounded dramatically. One very important reason for the return of the eagle was the federal government's decision in 1972 to ban the manufacturing of DDT in the United States. Programs by the Delaware River Basin Commission and other agencies and organizations to keep the river and its tributaries clean, the fish abundant, and the habitat undisturbed also have been a big help in the recovery of the bald eagle population throughout the basin.

The 120-mile stretch of the Delaware River from Hancock, N.Y. to the Delaware Water Gap is one of the largest and most important inland bald eagle wintering habitats in the Northeastern United States. This is based upon consistency of annual use and the numbers of eagles confirmed to be using the upper Delaware. This region provides areas of open water for foraging and prey (such as fish, waterfowl, and carrion), as well as adequate undisturbed upland areas for perching and roosting, which are all requisites for suitable overwintering habitat. The Delaware River is considered an "essential" bald eagle winter habitat, as specified by the Northern States Bald Eagle Recovery Plan. Preservation of "essential habitat" is considered necessary for the full recovery and long-term survival of this species.

In New York State, only one pair of bald eagles nested in 1976; this number has dramatically increased to 323 breeding pairs in 2017, a new record, thanks to conservation efforts. The upper Delaware River Watershed provides prime eagle viewing in the winter, and it has become a popular off-season activity. The New York State Dept. of Environmental Conservation works cooperatively with the Delaware Highlands Conservancy and the National Park Service Upper Delaware Scenic and Recreational River to help visitors find and properly observe wintering eagles.

The Pennsylvania Game Commission reports that 239 bald-eagle nests were documented in Pennsylvania in 2016, with eagles nesting in at least 56 of the state's 67 counties. As a comparison, there were only three known nesting pairs in 1980. The Poconos and upper Delaware River region are home to one of the three largest concentrations of eagle nests in the state. Bald eagles have even nested successfully in Philadelphia and other areas along the tidal Delaware River (south of Trenton, N.J.).

According to the New Jersey Division of Fish and Wildlife, the statewide number of active breeding pairs, those which laid eggs, has increased from a low of one in 1982 to 185 in 2018. Of those, 121 nests were successful and produced 172 young. Most nests are located in the southern part of the state, particularly within about 12.5 miles of the Delaware River and Bay. To compare, fewer than 10 bald eagles were observed in the state in 1978. 

In 2016, Delaware Division of Fish and Wildlife biologists documented 71 bald eagle pairs with approximately 72 chicks. During the 1980s, there were as few as two to four nesting pairs in the entire state.

Hopefully, ongoing bald eagle restoration programs will result in even greater numbers of this living symbol of America's freedom and spirit returning to a river which witnessed a nation's birth.

Did You Know?
  • Are bald eagles bald? No, their heads are covered with feathers which turn white as the birds mature. The word "bald" is a derivative of "balde," an old English word meaning white.
  • Eagles and other birds have three eyelids. There are two outside eyelids; the bottom is bigger than the top, so they blink up instead of down. The inner eyelid is called a nictitating membrane; it grows in the inner corner of the eye, right next to the tear duct, is transparent, and sweeps across the eye from side to side.
  • Bald eagles hold the record for the biggest bird nest ever built. One nest in Florida was over 20 feet deep, over nine feet wide, and weighed almost three tons!
  • Eagles have special feet with talons, not claws. Why? Talons are designed to carry things. An eagle foot has four muscular toes, powerful enough to hang onto a large fish as it carries it through the air.