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
History of the Yosemite area park over the summer of 1970, triggering a riot on July 4 after rangers tried to evict visitors from camping illegally in Stoneman Meadow. Rioters attacked the rangers with rocks, and pulled mounted rangers from their horses. The National Guard was brought in to restore order. The Yosemite Park and Curry Company was bought by Music Corporation of America (MCA) in 1973. In 1988, concessionaires brought in $500 million ($ as of 2019), and paid the federal government $12.5 million ($ as of 2019) for the franchise. Delaware North Companies became the primary concessionaire for Yosemite in 1992. The agreement