Clarence Hawkes,
Shaggycoat: The Biography of a Beaver
“ So you see the beaver had planned his work well and the frost and the wind had helped him. He had harnessed the stream to do his work, and made its water protect him from his enemies. Just as men built their castles in days of old, the beaver had made his dam, so that a moat should surround his house, where the drawbridge should always be up, and the only way of entrance or exit should be by water. ”
