By John Organ — Nearly 100 years ago Aldo Leopold, the father of game management, coined the term “harvestable surplus.” The intended meaning of the term is that some wildlife species and populations may produce more young in a given year than can survive to the following year. Those individuals doomed to die over the winter, for example, represent the “surplus” in the population. Leopold observed that those surplus animals could be killed by hunters during the fall, instead of succumbing to winter mortality, and there would be little impact on the population. So, in theory, hunting would be sustainable because the population would not change.