A dozen times during this night Broken Tooth halted to investigate the food supplies along the banks. But in the two or three places where he found plenty of the bark on which they lived it would have been difficult to have constructed a dam. His wonderful engineering instincts rose even above food instincts. And when each time he moved onward, no beaver questioned his judgment by remaining behind. In the early dawn they crossed the burn and came to the edge of the swamp domain of Kazan and Gray Wolf. By right of discovery and possession that swamp belonged to the dog and the wolf. In every part of it they had left their mark of ownership. But Broken Tooth was a creature of the water and the scent of his tribe was not keen. He led on, traveling more slowly when they entered the timber. Just below the windfall home of Kazan and Gray Wolf he halted, and clambering ashore balanced himself upright on his webbed hindfeet and broad four-pound tail. Here he had found ideal conditions. A dam could be constructed easily across the narrow stream, and the water could be made to flood a big supply of poplar, birch, willow and alder. Also the place was sheltered by heavy timber, so that the winters would be warm. Broken Tooth quickly gave his followers to understand that this was to be their new home. On both sides of the stream they swarmed into the near-by timber. The babies began at once to nibble hungrily at the tender bark of willow and alder. The older ones, every one of them now a working engineer, investigated excitedly, breakfasting by nibbling off a mouthful of bark now and then.