Y is for Yellow-Bellied Marmot
A lot of people think this is a groundhog or woodchuck. The Yellow-Bellied Marmot is very closely related to the groundhog that is common in the eastern United States.
Did You Know?
Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.