As this Idaho Mountain Express and Guide article points out, while global warming and development is driving some animals north, Shiras moose are heading south and west, populating some areas well beyond their historic range. Scientists admit they don't know what accounts for the move, but at least one wonders about the Western reintroduction of wolves, noting that "If wolves are putting pressure on moose, they will go some place where there aren't wolves." (Click here for the story)