Since the wolves were originally in YNP and served an ecological purpose, they should be reintroduced to the park. Therefore, everything possible was done to exterminate the wolf. In 1973, the Endangered Species Act was passed, and it required listed wildlife to be restored to safety. It has taken millions of years of evolution for the major habitats of the world to reach an ecological balance. Man has destroyed that balance in YNP by eliminating the wolf.
Wolves tend to prey on the unfit, elderly, or young because they are easy targets.
This keeps the population of the herds in balance with their food source. This results in a stable and healthy population which allows the wolves to continue to prey on the herd. Contrary to the popular belief that wolves deplete ungulate herds, they actually keep the herds healthy. Moose reactions to the presence of wolves. Unharmed after being surrounded.