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no dams have ever been built on it, leaving the yellowstone every bit as wild and untamed as it was when hayden first saw it. [gentle music] the yellowstone moves east and south through this part of the park before branching off into a 40-mile-long tributary called the lamar river. this leads straight to the fertile valley that is the mecca of northern american wildlife. [dramatic music] [animals grunting] [dramatic music continues] lamar valley is often referred to as the american serengeti. [dramatic music] [animals braying] the abundant tall grasses and endless supply of fresh water