Eggs

one of the main ways the U.S. has helped bring back up the bald eagle population was finding a bald eagle nest and switching the eggs with fake ones. they did this because when the eagle would sit on the egg the effects of DDT would cause it to crack. then when the egg was about to hatch they would put back the egg; careful not to be seen by the eagle because if your near its eaglets (baby bald eagles) or eggs the mother will attack you. We also took in bald eagles into special places where they would breed and then be set into the wild.