From Arctic Tundra to Tropical Reefs: The Vast Biological Diversity of the United States
In short: The United States hosts an extraordinary range of wildlife, from the endemic species of the Hawaiian Archipelago to the massive grizzly bears of Yellowstone. With over 100,000 insect species and hundreds of mammals, birds, and fish, the country's diverse ecoregions support a complex, often protected, tapestry of life.
The fauna of the United States is defined by its immense geographic variety, spanning the Nearctic, Neotropic, and Oceanic faunistic realms. This diversity is anchored by protected areas, with over 6,770 national parks and protected sites covering more than 1,006,619 square miles. Yellowstone National Park, established in 1872, remains a premier habitat for megafauna, including the gray wolf and grizzly bear. Across the country, ecological zones range from the alpine glaciers of the North Cascades to the arid deserts of the Southwest, where the Sonoran Desert alone hosts eleven species of rattlesnakes.
The nation's biodiversity is not static; it is shaped by both adaptation and human intervention. In Hawaii, nearly 90 percent of the fauna is endemic, having evolved in isolation. Conversely, the continental U.S. has seen significant shifts due to extinction and reintroduction. The eastern elk was declared extinct in 1880, and the sea mink was hunted to extinction by 1903. However, conservation efforts have allowed elk populations to recover in states like Kentucky and Tennessee. Invasive species also play a role, such as the nutria in Louisiana's swamps or the Javan mongoose in Hawaii, which has altered the distribution of native bird populations.
Marine life is equally expansive, particularly along the Atlantic and Pacific coasts. The U.S. waters host a wide array of cetaceans, from the 45-ton gray whale found in Alaska to various dolphins and seals. Hawaii's coral reefs alone support over 5,000 species, a quarter of which are unique to the region. Whether it is the widely distributed red-tailed hawk or the highly localized island fox of the Channel Islands, the American landscape remains a critical, if changing, sanctuary for global biodiversity.
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- Summary by Intellect · source: Fauna of the United States
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