The digitized version of this film has sound. A film letter documenting the expedition led by Olaus and Margaret (Mardy) Murie during the summer of 1956 along the Sheenjek River in northern Alaska. The expedition was sponsored by the New York Zoological Society and included George Schaller as a young assistant. The film is narrated by Olaus and Mardy Murie and was filmed by Robert Krear and produced by the Conservation Foundation.