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Gold interest, railroad barons, congress. Powerful people wanted this land for themselves, but something happened during their threemonth journey, and, slowly but surely, their mission changed. So, as we celebrate the 150th anniversary of Yellowstone National park, we take a look back in time at the events that led to the preservation of this magical place. [solemn music] [dramatic music] [waterfall rumbling] [waterfall continues rumbling] [birds chirping] [gentle music] [gentle music continues] sometimes i think about the things that im gonna miss the most when i finally have to walk away. [g...

gold interest, railroad barons, congress. powerful people wanted this land for themselves, but something happened during their three-month journey, and, slowly but surely, their mission changed. so, as we celebrate the 150th anniversary of yellowstone national park, we take a look back in time at the events that led to the preservation of this magical place. [solemn music] [dramatic music] [waterfall rumbling] [waterfall continues rumbling] [birds chirping] [gentle music] [gentle music continues] sometimes i think about the things that i'm gonna miss the most when i finally have to w...

And home to one of the most iconic animals in us history, the great american bison. [uplifting music] weighing up to a ton and standing six feet tall at the hump, these are the largest mammals in north america. [uplifting music] and the yellowstone herd are the only pure descendants left of the asian bison who migrated across the land bridge to north america 400,000 years ago, [uplifting music] [foreboding music] [bison grunting] [birds chirping]

And, in july and august, right when the hayden party was making their way down these hills, dust fills the air in the valley. [foreboding music] [bison grunting] the bison run is underway. [foreboding music] [bison grunting] female bison tend to mate with the most dominant bulls. [foreboding music] [bison grunting] this wallowing behavior by the males is a display of power and aggression. [foreboding music] during the mating season, each bull will lose around 200 pounds, dedicating all his time and energy to performing for the potential mates. [foreboding music] [bison grunting] it's an intere...

[gentle music continues] each ring of color is a different type of bacteria that thrives at a different temperature, but bacteria aren't the only lifeforms that have adapted to the unique geology here. [gentle music] [bison grunting] bison migrate to the thermals in winter, where heat melts away the heavy snow, exposing the grass below. [gentle music] [birds chirping] cliff swallows come every spring to make condos out of the pocked sandstone mounds left behind by the dormant hot springs of the past. the ever-morphing geology of yellowstone built these homes. all they have to do is move in. [g...