Our bear cubs begin to play just as soon as they emerge from their natal den, in March or April, and they keep it up until they are six or seven years of age,--or longer! Our visitors take the playfulness of small cubs as a matter of course, but the clumsy and ridiculous postures and antics of fat-paunched full-grown bears are irresistibly funny. Really, there are times when it seems as if the roars of laughter from the watching crowd stimulates wrestling bears to further efforts. On October 28, 1921, about seventy boys stood in front of and alongside the den of two Kluane grizzly cubs and shouted for nearly half an hour in approval and admiration of the rapid and rough play of those cubs. [Illustration with caption: ADULT BEARS AT PLAY] The play of bears, young or middle-aged, consists in boxing, catch-as-catch-can wrestling, and chasing each other to and fro. Cubs begin to spar as soon as they are old enough to stand erect on their hind feet. They take their distance as naturally as prize-fighters, and they strike, parry and dodge just as men do. They handle their front feet with far more dexterity and precision than boys six years of age. Boxing bears always strike for the head, and bite to seize the cheek of the opponent. In biting, mouth meets mouth, in defense as well as attack. When a biting bear makes a successful pass and finally succeeds in getting a firm toothhold on the cheek of his opponent, the party of the second part promptly throws himself prone upon the ground, and with four free feet concentrated upon the head of the other bear forces him to let go. This movement, and the four big, flat foot soles coming up into action is, in large bears, a very laughable spectacle, and generally produces a roar. Wrestling bears roll over and over on the ground, clawing and biting, until one scrambles up, and either makes a new attack or rushes away. Bears love to chase one another, _and be chased;_ and in this form of skylarking they raise a whirlwind of activity which leads all around the floor, up to the balcony and along the length of it, and plunges down at the other end. Often a bear that is chased will fling himself into the bathing pool, with a tremendous splash, quickly scramble out again and rush off anew in a swirl of flying water. The two big male polar bears that came to us from the William Hagenbeck group were very fond of playing and wrestling in the water of their swimming pool. Often they kept up that aquatic skylarking for two hours at a stretch, and by this constant claw work upon each other's pelts they kept their coats of hair so thinned down that we had to explain them. One bear had a very spectacular swimming trick. He would swim across the pool until his front feet touched the side, then he would throw himself over backwards, put his hind feet against the rock wall, and with a final shove send himself floating gracefully on his back across to the other side.