Elk go to wildlife refuges to find food each fall. If a refuge gets overcrowded, disease can spread among them and plants may get damaged. Is the answer to bring in extra food for the elk? To lower their numbers by allowing hunting? To open a refuge in another location?
If you go into this field, you'll have to make decisions about how to best preserve natural areas and the animals and plants that live in them. This can be tough when the needs of two species conflict and when your choices can determine whether a species survives or dies out.