The Bald Eagle’s Remarkable Comeback: A Conservation Success Story
Once close to extinction in the contiguous United States, the bald eagle has made a remarkable recovery through decades of legal protection, habitat conservation, and restrictions on harmful pesticides.
By 1963, only 417 known nesting pairs remained in the lower 48 states.
Population declines were driven by several factors, including shooting, habitat loss, and DDT exposure. DDE, a breakdown product of DDT, caused eggshell thinning in bald eagles and other birds of prey, reducing reproductive success.
The recovery involved several important protections. The Bald and Golden Eagle Protection Act, enacted in 1940, protects bald eagles from actions including taking, killing, selling, purchasing, or possessing eagles, their nests, or their eggs without authorization. In 1972, the U.S. Environmental Protection Agency banned most uses of DDT in the United States. Habitat protection, nest-site management, improved water quality, and recovery work by federal, state, Tribal, and local partners also contributed to the species’ return.
In 2007, the U.S. Fish and Wildlife Service removed the bald eagle from the federal list of threatened and endangered species after its recovery in the lower 48 states. The species remains protected under federal laws, including the Bald and Golden Eagle Protection Act and the Migratory Bird Treaty Act.
The most recent U.S. Fish and Wildlife Service population estimate, based on 2018 and 2019 data, found approximately 316,700 bald eagles in the lower 48 states, including about 71,400 nesting pairs. This figure does not represent all of North America. Alaska alone has an estimated 70,000 bald eagles, so it is more accurate to describe the 316,700 figure as an estimate for the contiguous United States rather than for North America as a whole.
The bald eagle’s recovery is an important conservation success story. It shows how science-based environmental policy, protection of wildlife habitat, enforcement of conservation laws, and long-term public commitment can help species recover. Continued protection remains important because bald eagles can still face threats from habitat loss, lead poisoning, collisions, disturbance near nests, and environmental contamination.
U.S. Fish and Wildlife Service, “Bald Eagle
”https://www.fws.gov/species/bald-eagle-haliaeetus-leucocephalus
U.S. Fish and Wildlife Service, “Eagle Population Status”
https://www.fws.gov/project/eagle-population-status
U.S. Environmental Protection Agency, “The Case of DDT: Revisiting the Impairment”
https://www.epa.gov/caddis/case-ddt-revisiting-impairment
U.S. Environmental Protection Agency, “Eagles, Other Birds Thrive After EPA’s 1972 DDT Ban”
https://www.epa.gov/archive/epa/aboutepa/eagles-other-birds-thrive-after-epas-1972-ddt-ban. html
Alaska Department of Fish and Game, “Bald Eagle Species Profile”
https://www.adfg.alaska.gov/index.cfm?adfg=baldeagle.printerfriendly
National Geographic, “Why Bald Eagles Were Nearly Extinct and How They Bounced Back”