In 1973 Congress passed the Endangered Species Act. In 1980 Acadia National Park worked on a plan to restore the population of Peregrines in the eastern USA. They wanted to restore 50% of the 350 pairs estimated that were in the eastern USA in 1940's.Falcons eggs are taken from the moms and incubated in a hatched laboratory. They are kept there four a couple of weeks.In a wooden box but with a sight of the land.When they have strong wings they are let loose.They still come to eat at the hack site until they learn how to hunt on their own.