No matter in what area we went in the Rocky Mountains there were always some chipmunks or squirrels present. The smallest one of them is the Least Chipmunk. They are much smaller than the Eastern Chipmunk that we have here at home in Iowa. The little guys were all very busy finding food for the long winter. The Least Chipmunk's diet contains seeds, fruits, berries, and grasses but it also eats fungi and invertebrates. We had a lot of fun watching them.