 Historically, peregrines bred throughout New Hampshire's White Mountains, but widespread use of the pesticide DDT caused them to disappear from the state and throughout eastern North America by the 1960s. Biologists released captive-raised peregrines, hoping to reestablish the species in the wild. In 1981, Eagle Cliff hosted a successful peregrine nest, the first on a natural rock face in the eastern U.S. since the population crashed.