Beginning in 1974, North American conservationists released more than 6,000 captive-bred peregrine falcons; by the late 1990s, at least 1,650 breeding pairs had been restored

The peregrine falcon, once on the brink of extinction across much of North America, is again soaring over cliffs, coastal areas, and even cities. The return of the peregrine falcon to the skies is not due to a single discovery or conservation measure, but the result of years of work by scientists, wildlife organizations, and captive breeding efforts. During the 1970s, after the bird became extinct in many of its native habitats, conservationists released captive-raised falcons into the wild in an effort to reintroduce the species. As reported by the U.S. Fish & Wildlife Service, over 6,000 peregrine falcons were released to the wild through recovery efforts beginning in 1974, restoring the species to 1,650 breeding pairs in the United States and Canada by the late 1990s.

A bird brought back from the brink

Peregrine falcons were once very prevalent throughout North America, with nests on cliffs and feeding on birds at extreme speeds. Yet, following World War II, the extensive use of a pesticide known as DDT led to one of the most severe challenges the species ever faced. This pesticide built up in their systems and resulted in eggs that were too thin to hatch. By the time the 1960s and 1970s came around, many peregrine falcons had vanished from many parts of the eastern United States and Midwest. The plight of the peregrine falcons became a symbol of what human activity can do to wildlife. The peregrine falcons were listed as endangered in 1970, requiring recovery strategies for the species. U.S. Fish and Wildlife Service


Wildlife experts began exploring whether captive breeding could help restore populations that could no longer recover quickly on their own. They figured out how to breed falcons and prepare them for life in the wild. One of the key strategies they used was called “hacking,” where young birds were put in artificial nest sites and gradually acclimated to their surroundings before being released to the wild. The first experimental releases of captive-produced peregrines took place in 1974 and 1975. These early efforts became the foundation of a much larger restoration program involving federal agencies, state wildlife departments, universities, and private conservation organizations.

Building a recovery network across North America

More than just releasing the peregrines was involved in bringing back the bird. The scientists had to know the proper habitat for the species, observe the released falcons, and ensure breeding populations. Gradually, the project grew in scope from one location to another. Conservationists were releasing falcons into places that no longer hosted falcons in abundance. Also, the scientists found out how adaptable peregrines can be.

It turned out that besides natural nests like cliffs, the falcons were nesting in urban settings such as skyscrapers and bridges, substituting for their natural habitat. Urban environments offered the benefit of an elevated place for the nesting site along with plenty of pigeons and other birds, which served as the falcons’ prey. The federal recovery record explains that captive-bred falcons released through restoration programs helped reestablish breeding populations in regions where peregrines had been lost, accelerating the species’ return across its historic range.

From endangered species to conservation milestone

In 1999, the U.S. Fish & Wildlife Service delisted the American peregrine falcon from the list of federally endangered species. This was considered one of the most remarkable success stories under the Endangered Species Act. The success of the conservation program had brought about a new approach to wildlife restoration. Apart from protection of the existing population, conservation programs started to pay more attention to recovery techniques such as captive breeding and habitat management. The case of the peregrine falcon has proved that species recovery can take several decades; however, tangible results can be achieved through joint efforts of research and conservation.

The peregrine’s return demonstrated that species recovery could require decades of effort, but measurable progress was possible when research and conservation planning worked together. The conservation program had yielded results that were not expected before. Data collected from surveys revealed that there was a considerable increase in the number of peregrines, with breeding pairs appearing in places where the species had been absent for decades.

A legacy beyond one species

Today, the recovery of the peregrine falcon continues to influence conservation through methods that have been applied to other endangered species requiring managed breeding and release programs.

Furthermore, the recovery of the bird proved to people that animals are able to adapt to changing circumstances. In particular, the fact that peregrines started nesting in urban areas shows that sometimes successful conservation doesn’t mean bringing the animals back to the same conditions they used to live in; sometimes it is helping them find a new way of survival. More than 50 years after the first recovery releases began, the peregrine falcon remains one of North America's best-known examples of long-term conservation success.