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    Stacker compiled a list of 25 endangered animals that are only found in the United States using the International Union for Conservation of Nature (IUCN) Red List and the U.S. Fish and Wildlife Service Endangered Species list.   

    The track of the Yellowstone hotspot is defined by a series of old caldera systems that get older the farther to the southwest you get from Yellowstone.  Because they are mostly buried, it took decades of geologic investigations to identify these features.

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