By 1820, the company was issuing coinage, each coin representing the value of one beaver pelt.
en.wikipedia.org During winter, the river otters heavily use openings in the ice, and may excavate passages in beaver dams for accessing open water.
en.wikipedia.org However, it is positively associated with the number of beaver flowages, watershed length, and average shoreline diversity.
en.wikipedia.org The wide variety of mammals inhabiting the park include beaver, nutria, river otter, cottontail rabbit, raccoon, muskrat, mule deer, mink, and coyote.
en.wikipedia.org