Though the problem of getting a living makes up most of the grizzly's daily programme, he knows the wisdom of taking time off and having a change from the routine of life. The ability to concentrate in eager play is probably one of the best evidences of the grizzly's unusual brain-power. It is good to know that, although most of the time he lives alone and takes things seriously, he also has the power to relax and to build and restore himself in play. This may help to give contentment to solitary life in home territory. When well fed, the grizzly sometimes strolls over his estate and pauses to watch the antics of other wild life. He will stand in a stream to see the ways of water-ouzels. The sliding of otter at play appears to interest him, and I have discovered otter-slides by following his tracks to them. Once, when I was enjoying the play of a number of beaver racing and splashing in a pond, a grizzly watched them for a time from the edge of the woods, then came out on the dam and sat down where he could better see them. Though a solitary and self-contained baron, he has many entertaining interests. There are times at home, or abroad, when the grizzly is not deeply interested in anything, when time hangs a little heavy on his hands, or on his mind. Sometimes at home he doesn't quite know what to do with himself. He isn't hungry, he can't think of any place where he cares to go, he isn't interested in swimming, he doesn't even want to play. He doesn't care to lie down and sleep. He starts off languidly, stops, moves on, rears up, takes a bite out of the bark of a tree; but he doesn't care for the bark to eat and doesn't even look up to see how high he has bitten. The grizzly is a descendant of a long line of wanderers and may occasionally explore surrounding territory for sheer adventure. If much harassed by settlers, he will move to a permanent home in lands far distant. It would be comparatively easy for a grizzly to become acquainted with four or five thousand miles of territory. He travels rapidly, has endurance, and in a single night could cover a hundred miles or more. Some bears get the idea of territorial expansion and go forth to seize a part of a neighbor's hunting-ground. Thus one bear may be annoyed by another who makes too frequent raids into his domain, and feel called upon to defend his territory against the invader. When past prime a bear is sometimes driven forth into an unfriendly world by a young, vigorous conqueror. On one occasion I tracked a grizzly for sixty miles from the margin of its home range. It traveled along a line that indicated it had a definite place in mind to which it was going. It explored a cañon region, and, a day or two later, as tracks in the snow showed, went back to its old range along the trail it had followed in leaving it.