A rock fell from a high cliff and struck upon solid granite near a grizzly whom I was watching. There was a terrific crash and roar. Unmindful of the flying fragments and pieces bounding near, the grizzly reared up and pressed fore paws over his ears. Just as he was uncovering them the echo came thundering and booming back from a cliff across the lake. Again he hastily covered his ears with his paws to soften the ear-bursting crash. On another occasion a wounded bear took refuge in a small thicket where the hunter was unable to get a shot at him. After failing to force the bear into the open, the hunter gave a wild, ear-splitting yell. With a growl of pain the bear at once chained furiously through the thicket toward the hunter. A grizzly has supersensitive ears, and loud, harsh sounds give his nerves a harrowing shock. Through his higher development the grizzly probably suffers more intensely and enjoys more fully than other animals. The clashing city noises must be a never-ending irritation and torture to a bear who has been sentenced to end his days in a riotous environment. How he must yearn for the hush of the wilderness! And, as his sense of smell is also amazingly developed, perhaps he longs for a whiff of pine-spiced air and the wild, exquisite perfume of the violets. Experience in many zoos has shown that subjecting caged grizzlies to close contact with people is usually cruelty to animals. Often they become cross, and a number of crowd-worried grizzlies have died prematurely from resultant apoplexy. Modern zoo bear-pens are constructed so that the bear is beyond the wiles of visitors--so that he can have much privacy--one of the needs of any grizzly. Perhaps we too often think of the bulky grizzly as being coarse and crude. But he is an animal of the highest type, sensitive, independent, and retiring. The normal bear is good-tempered and cheerful. A grizzly placed in new environment in association with men will respond happily only to considerate handling and proper feeding. Tell me what a bear is fed and how, and I will tell you what the bear is--his disposition and health. A grizzly should be fed by no one except his keeper. If any one and every one feed a bear, he is likely to receive food that he ought not to eat and to have it given in a manner annoying to him. Feeding is the vital consideration for grizzly pets, for grizzlies in zoos, and for grizzlies in National Parks. When I arrived in Colorado, in 1884, grizzlies were still common throughout the mountain areas of the State. They were numerous in a few rugged sections where there were but few people and plenty of food. In the Long's Peak region around my cabin, I early discovered the tracks of five grizzlies. One or two missing toes or some other peculiarity enabled me to determine the number. Two of these bears ranged near, and I had frequent glimpses of them.