Good nature material -- not sentimentalized -- in a slimly fictionized story of a young beaver, thrust out from his home colony and forced to fend for himself. He finds a new creek; he builds a burrow and starts a dam; he goes back for his mate and fights for her. Then he returns, to find his work lest, and bears in possession. One gets the whole struggle of the wild for survival, concentrated into this story of Pennsylvania woodland years ago when bear and bob cat, turkey, muskrat, otter and beaver were in occupancy, with man and civilization the only enemies that ""Chiseltooth"" could not cope with. Conservation message implicit, when the beaver's dam saves man's constructions from flood.