Peregrine falcons are on the endangered species list in New York State. Their decline was mainly said to be caused by the pesticide DDT, which caused reproductive problems and thinning of the eggshells. Releasing of the birds of prey in the years 1974 to 1988, has helped with the return of the Peregrine falcons as a nesting species, which was no longer happening in the 1960's. In 1983, Peregrine falcons were seen nesting on two bridges in New York City and then, in 1985, Peregrine falcons were again nesting in the Adirondacks. Now, there are known to be 50 pairs throughout New York State. They nest on buildings, bridges, and cliffs and can be seen in the Adirondacks, Syracuse, Albany, Binghamton, Rochester, and Buffalo. The nesting sites are monitered and managed to promote the nesting. Their nesting season is from March through July. They usually return to the same nesting area every year and they mate for life.
During their nesting season, work on the buildings or bridges that have nests is postponed and the same goes for any outdoor activity that would disturb the nesting, such as rock climbing. As soon as the nesting season is over, the work or outdoor activity can resume. The Peregrine falcon is a bird of prey and usually feasts on other birds, such as pigeons in the city areas.