I now suspect that just as a deer herd lives in mortal fear of its wolves, so does a mountain live in mortal fear of its deer. And perhaps with better cause, for while a buck pulled down by wolves can be replaced in two or three years, a range pulled down by too many deer may fail of replacement in as many decades.

A Sand County Almanac, and Sketches Here and There (ed. Oxford University Press, USA, 1989) - ISBN: 9780195059281