National parks provide critical habitat for a variety of animals—in some cases, they are the only places that threatened or endangered species have left to call home.
Olympic National Park providing suitable habitat to Pacific fishers and Badlands and Wind Cave National Parks, South Dakota conducted a breeding program for Black-footed ferrets and now they are living in the wild again. Yellowstone National Park put its all efforts to save Gray wolves and they succeeded big time. Channel Islands National Park, California helps to save bald eagle from extinction.
Hawai'i Volcanoes National Park, Hawaii is working to save nine native species of goose and they have reasonable success in this project.
Animals need us as much as we need them. This benefit should be mutual.