With a scarcely perceptible motion, the man turns his head to watch the swimmers. Instantly, down they plunge, mother and babies, to come to the surface again higher up-stream, evidently working up-current like the beaver in spring for a glorious frolic in the cold clear waters of the upper sources. At one place on the sandy beach they all wade ashore. The man utters a slight "Hiss!" Away they scamper, the foolish youngsters, landward instead of to the safe water as the hesitating mother would have them do, all the little feet scrambling over the sand with the funny short steps of a Chinese lady in tight boots. Maternal care proves stronger than fear. The frightened mother follows the young otter and will no doubt read them a sound lecture on land dangers when she has rounded them back to the safe water higher up-stream. Of all wild creatures, none is so crafty in concealing its lairs as the otter. Where did this family come from? They had not been swimming up-stream; for the man had been watching on the river bank long before they appeared on the surface. Stripping, the trapper dives in mid-stream, then half wades, half swims along the steepest bank, running his arm against the clay cliff to find a burrow. On land he could not do this at the lair of the otter; for the smell of the man-touch would be left on his trail, and the otter, keener of scent and fear than the mink, would take alarm. But for the same reason that the river is the safest refuge for the otter, it is the surest hunting for the man--water does not keep the scent of a trail. So the man runs his arm along the bank. The river is the surest hunting for the man, but not the safest. If an old male were in the bank burrow now, or happened to be emerging from grass-lined subterranean air chambers above the bank gallery, it might be serious enough for the exploring trapper. One bite of nekik the otter has crippled many an Indian. Knowing from the remnants of half-eaten fish and from the holes in the bank that he has found an otter runway, the man goes home as well satisfied as if he had done a good day's work. And so that winter when he had camped below the swamp for the mink-hunt, the trapper was not surprised one morning to find a half-eaten fish on the river bank. Sakwasew the mink takes good care to leave no remnants of his greedy meal. What he cannot eat he caches. Even if he has strangled a dozen water-rats in one hunt, they will be dragged in a heap and covered. The half-eaten fish left exposed is not mink's work. Otter has been here and otter will come back; for as the frost hardens, only those pools below the falls keep free from ice. No use setting traps with fish-heads as long as fresh fish are to be had for the taking. Besides, the man has done nothing to conceal his tracks; and each morning the half-eaten fish lie farther off the line of the man-trail.