Yosemite National Park is causing the problem. Despite the richness of high-quality habitats in Yosemite, the brown bear, California condor, and least Bell's vireo have become extinct in the park within historical time, and another 37 species currently have special status under either California or federal endangered species legislation. The most serious current threats to Yosemite's wildlife and the ecosystems they occupy include loss of a natural fire regime, exotic species, air pollution, habitat fragmentation, and climate change. On a more local basis, factors such as road kills and the availability of human food have affected some wildlife species. Yosemite National Park has
DNC Parks and Resorts at Yosemite, Inc. vs. The United States of America contractual rights. They characterized the park service's position as "taking Aramark's side." Delaware North also noted that payment would be made by Aramark, not the federal government. The same contract with the park service required that any successor to Delaware North would have to buy out its Yosemite-related assets at fair market prices. Indeed, when the government put the concession contract for Yosemite up for bid, the notices it published explicitly stated the winner would be required to purchase furniture, equipment, vehicles, and "other property." The National Park Service, by request of Delaware North, amended the bid notice to explicitly