iPhone photo by David Guttenfelder. We stopped our horses to rest before descending into the next basin on day 17 of a horseback trip into the backcountry of the Gallatin National Forest. When I was a boy we had horses on my parents Iowa farm, but I hadn't been on horseback again until this @natgeo assignment in the Greater Yellowstone Ecosystem. For more pictures of the ongoing trip, and the beauty of these Montana #horses, please check out @dguttenfelder by natgeo

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