Its downfall has been Yellowstone's gain. In 2010, William Ripple from Oregon State University in Corvallis reported that since the wolves' comeback, treees including aspen, willow, and cottonwoods have bouced back. More saplings survive, now that intimidated elk are less likely to nibble their lower branches ,and the older trees have doubled or even tripled in height . . ." (57) The wolves presence had brought a change there that was not there before they had made their return, and has made the Yellowstone park even better. There's new trees growing, and old ones had begun to grow again because the elks would no longer chew on them. Yellowstone is better witht the wolves that's why they should be