Agricultural and residential development, as well as recreational activity, has altered the wildlife community of the Monument. Mule deer are common. Red foxes, coyotes, badgers, cottontail rabbits, and yellow-bellied marmots are upland residents. River otter, beaver, muskrat, mink, and other furbearers are found in and around Hagerman’s ponds, marshes, and waterways.
Did You Know?
Lake Bonneville overflowed its rim about 15,000 years ago in southeastern Idaho near the present day city of Pocatello. The Snake River cut down through the ancient flood plain sediments and deepened and widened the Hagerman valley.