Why Dig Up Mountain Gorillas? July 27, 2009 No mountain gorilla is ordinary, but those found in northwest Rwanda are especially fascinating. They are the gorillas studied by legendary primatologist Dian Fossey — the "gorillas in the mist." Now, researchers are exhuming the descendants of those gorillas, in the search of clues to primate evolution. Researcher Erin Marie Williams is part of that team, and has sent dispatches from the field.