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.
Aldo Leopold (1989). “A Sand County Almanac, and Sketches Here and There”, p.132, Oxford University Press, USA
