On August 9, 2007, the bald eagle (Haliaeetus leucocephalus) was officially removed from the list of threatened and endangered species. This remarkable achievement required many threads to come together, including the publication of a ground-breaking book, the creation of a list of endangered species, a growing political movement, and the formation of the EPA.
When the bald eagle was adopted as the national bird of the United States in 1782, there were as many as 100,000 of them soaring in the skies across the country. However, by 1940 their populations had begun to decline. The Bald Eagle Protection Act, which prohibited the eagles from being killed, sold, or kept in captivity, failed to stop the decline.
The reason for this continued decline was largely unknown, until the publication of Rachel Carson’s book Silent Spring in 1962 offered a clue. Carson warned of the effects of the pesticide DDT, which was in wide use in the U.S. at the time. She presented evidence that DDT contaminated water and the fish that lived in it. When prey birds, such as bald eagles, ate those animals, the DDT accumulated in their fatty tissues. DDT affected the strength of the birds’ eggshells. Thinner, more fragile shells would break prematurely, resulting in fewer baby eagles hatching successfully.
As environmental activism grew, Congress passed the first Environmental Protection Act in 1966. The following year, the first list of federally protected endangered species was created and included the bald eagle. Growing concern about the environment also led to the establishment of the Environmental Protection Agency in 1970. Though being on the endangered species list provided benefits such as the protection of the eagles’ nesting areas, the true turning point for the bald eagle came in 1972, when the newly formed EPA banned the use of DDT in the United States. After the banning of DDT, bald eagle populations began to recover, resulting in their delisting in 2007.
(dichloro-diphenyl-trichloroethane) toxic chemical used as an insecticide but illegal for most uses in the U.S. since 1972.
to remove from a list.
organism threatened with extinction.
Endangered Species Act
(1973) U.S. legislation that protects endangered species when they are threatened by human activity.
Environmental Protection Agency (EPA)
U.S. government organization whose mission is to "protect human health and the environment."
total number of people or organisms in a particular area.
happening before the expected time.
(1907-1964) American biologist and author.
organism that may soon become endangered.