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https://www.nps.gov/media/video/view.htm?id=A35E7E79-CDF6-74D8-26332556B9F2D5E2

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Yellowstone is seasonal. Plan your visit by learning about current conditions, seasons, road conditions, services, activities, and more.

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Whirling disease is caused by a microscopic parasite from Europe (Myxobolus cerebralis) that can infect some trout and salmon; it does not infect humans. The parasite feeds on the fish’s cartilage, and the infection can cause skeletal deformities, a blackened tail, and whirling swimming behavior.

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Yellowstone National Park is a nearly 3,500-sq.-mile wilderness recreation area atop a volcanic hot spot. Mostly in Wyoming, the park spreads into parts of Montana and Idaho too. Yellowstone features dramatic canyons, alpine rivers, lush forests, hot springs and gushing geysers, including its most famous, Old Faithful. It's also home to hundreds of animal species, including bears, wolves, bison, elk and antelope.