In one of my trips on a steamer of the Upper Missouri, one day while the boat's crew were getting their supply of wood, I took my gun and started along the river-bank in the hope of seeing an elk or deer that I might shoot. I came to a place on the river where the banks were very high, and I observed that a lot of cottonwood saplings from six to eight inches in diameter had been felled and cut into sections. I saw that it had been recently done, and I at first supposed that it had been done by some one with an ax, but when I reached the spot, I saw that it was the work of the beavers and that some of the wood had been dragged away. I followed the trail for a few steps, when I came to the mouth of a tunnel, and discovered that the timber had been dragged through it. The tunnel had an incline of about thirty-five degrees, and was as straight as if it had been made with an auger. This was in the month of October, at the time when it was their custom to stow away their food for the winter. They had no dam at this point, as the water was deep, and they were drawing the timbers down through the tunnel and sinking them in the deep water, so that they could have access to it during the period when the river would be frozen over. The reason for the tunnel, of which I have spoken, was that the river-bank for some distance was high and almost perpendicular, and the beaver, being a very clumsy animal with short legs, his only alternative was to make a tunnel in order to get his winter food. They have a way of sinking the cottonwood and keeping it down in their pond or simply in the deep water when they do not make dams. This family of beavers evidently had their house far under the surface of the ground, for the place was admirably adapted for them to make such a home, the banks being so high above the water. One could see no trace whatever of the beaver, or have a knowledge of where he was, more than the opening of the tunnel and where the timber had been cut; indeed, one might pass hundreds of times and not be conscious that beavers were living right under one's feet. I picked up one of the chips which the beaver had cut, measuring about seven inches in length, and carried it home with me as a curiosity. CHAPTER XXVI. A BOY'S TRIP OVERLAND.