Yellowstone at 150: busier yet wilder than ever, says park’s ‘winterkeeper’

From the return of wildlife to the pressures of tourism and the climate crisis, Steven Fuller has seen it all in his nearly 50 years watching over America's oldest national park

Read more: Native Americans are at the heart of Yellowstone. After 150 years, they are finally being heard

As winterkeeper" at Yellowstone national park, Steven Fuller lives in a rustic cedar-shingled cottage, built in 1910, set on a hill a short walk from the majestic Grand Canyon of the Yellowstone.

On balmier days, with the windows open, he can hear the roar of the 308ft Lower Falls tumbling into the chasm. In autumn, he is treated to the sound of bugling bull elk in rut or, in the middle of night, the howls of wolves.