Following the afternoon when Gray Wolf and Kazan struck into the north came the clear still night when Broken Tooth climbed to the top of the dam, shook himself, and looked down to see that his army was behind him. The starlit water of the big pond rippled and flashed with the movement of many bodies. A few of the older beavers clambered up after Broken Tooth and the old patriarch plunged down into the narrow stream on the other side of the dam. Now the shining silken bodies of the emigrants followed him in the starlight. In ones and twos and threes they climbed over the dam and with them went a dozen children born three months before. Easily and swiftly they began the journey down-stream, the youngsters swimming furiously to keep up with their parents. In all they numbered forty. Broken Tooth swam well in the lead, with his older workers and battlers behind him. In the rear followed mothers and children. All of that night the journey continued. The otter, their deadliest enemy--deadlier even than man--hid himself in a thick clump of willows as they passed. Nature, which sometimes sees beyond the vision of man, had made him the enemy of these creatures that were passing his hiding-place in the night. A fish-feeder, he was born to be a conserver as well as a destroyer of the creatures on which he fed. Perhaps nature told him that too many beaver dams stopped the run of spawning fish and that where there were many beavers there were always few fish. Maybe he reasoned as to why fish-hunting was poor and he went hungry. So, unable to cope singly with whole tribes of his enemies, he worked to destroy their dams. How this, in turn, destroyed the beavers will be seen in the feud in which nature had already schemed that he should play a part with Kazan and Gray Wolf.