Nitrogen-fixing bacteria, as demonstrated by the acetylene reduction method; yeasts, and actinomycetes were found in feces of mammals collected from St. Lawrence Island, Alaska, to the North Carolina-Tennessee border. The mammals, representing four orders and 19 species, occupy a wide variety of habitats and may play an important role in dispersing microorganisms vital to the ecosystem.
Li, C. Y.; Maser, Chris; and Fay, Harlan
"Initial survey of acetylene reduction and selected microorganisms in the feces of 19 species of mammals,"
Great Basin Naturalist: Vol. 46
, Article 7.
Available at: http://scholarsarchive.byu.edu/gbn/vol46/iss4/7