People cannot live apart from nature; that is the first principle of the conservationists. And yet, people cannot live in nature without changing it. But this is true of all creatures; they depend upon nature, and they change it. What we call nature is, in a sense, the sum of the changes made by all the various creatures and natural forces in their intricate actions and influences upon each other and upon their places. Because of the woodpeckers, nature is different from what it would be without them. It is different also because of the borers and ants that live in tree trunks, and because of
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