In 1974, more than 6,000 peregrine falcons were released into the wild after the population wiped out; helping restore the once-endangered birds across North America | World News - The Times of India
In the early 1974s, American peregrine falcons were struggling to survive in parts of North America. Years of DDT use had left many eggs with thin shells that could crack during incubation, leaving fewer chicks to hatch.