The river, for example, is the living symbol of all the life it sustains or nourishes - fish, aquatic insects, water ouzels, otter, fisher, deer, elk, bear, and all other animals, including man, who are dependent on it or who enjoy it for its sight, its sound, or its life. The river as plaintiff speaks for the ecological unit of life that is part of it.
Nature's Justice: Writings of William O. Douglas (ed. 2000)