Man is a great blunderer going about in the woods, and there is no other except the bear makes so much noise. ... The cunningest hunger is hunted in turn, and what he leaves of his kill is meat for some other. That is the economy of nature, but with it all there is not sufficient account taken of the works of man. There is no scavenger that eats tin cans, and no wild thing leaves a like disfigurement on the forest floor.