In a zoo one day, a piece of hard-tack that a grizzly bear wanted fell into the hands of a black bear. The black bear dipped the hard-tack in the water and then started to take a bite. Evidently it was too hard. He put it in the water again, and while it soaked gave his attention to something else. While the black bear was not looking, the grizzly, standing on the farther edge of the pool, stirred the water with a fore paw and started the hard-tack toward him on the waves. The instant the first wave touched the black bear he looked around, grabbed the precious hard-tack, which was rapidly floating away, and, pushing it to the bottom of the pool, put one hind foot upon it. How very like the mental processes of human beings! One day in North Park, Colorado, I came upon the carcass of a cow that wolves had recently killed. It lay in a grassy opening surrounded by willow clumps. Knowing that bears were about, I climbed into the substantial top of a stocky pine near by, hoping that one would come to feast. A grizzly came at sundown. When about one hundred feet from the carcass the bear stopped. Standing erect, with fore paws hanging loosely, he looked, listened, and carefully examined the air with his nose. The grizzly is eternally vigilant; he appears to feel that he is ever pursued. As the air was not stirring, I felt that he could not scent me in my tree-top perch. It may be, however, that he faintly caught my lingering scent where I had walked round the opening. After scouting for a minute or two with all his keen senses, he dropped on all fours and slowly, without a sound, advanced toward the willow clumps. In places of possible ambush the grizzly is extremely cautious. He is not a coward, but he does not propose to blunder into trouble. When within thirty feet of the waiting feast this bear redoubled his precautions against surprise and ambush by walking round the carcass. Then, slipping stealthily to the edge of a thick willow clump, he flung himself into it with a fearful roar, instantly leaping out on the other side ready to charge anything that might start from the willows; but nothing started. Standing erect, tense in every muscle, he waited a moment in expectant attitude. Then he charged, roaring, through another willow clump, and another, until he had investigated every possible place of concealment near the carcass. Not finding an enemy, he at last went to the carcass. When he had feasted for a few minutes he suddenly rose, snarled, and sniffed along my trail for a few yards. He uttered a few growling threats. That a grizzly cannot climb a tree is a fact in natural history which gave me immense satisfaction. But the bear returned to the carcass and finished his feast. Finally, having raked grass and trash over the remains, he doubled back on his trail and faded into the twilight.