Biology and Ecology
Yellowstone National Park is the centerpiece of the 20 million acre/31,250 square-mile (8,093,712 ha/80,937 km2) Greater Yellowstone Ecosystem, a region that includes Grand Teton National Park, adjacent National Forests and expansive wilderness areas in those forests. The ecosystem is the largest remaining continuous stretch of mostly undeveloped pristine land in the continental United States,considered to be the world's largest intact ecosystem in the northern temperate zone (although the area is mostly not temperate but subalpine, and all the national forest lands surrounding the National Park are not intact). With the successful wolf reintroduction program, which began in the 1990s, virtually all the original faunal species known to inhabit the region when white explorers first entered the area can still be found there.
Read more about this topic: Yellowstone National Park
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