This is such a worthwhile video that shows how the introduction of wolves to Yellowstone National Park have made a tremendous difference primarily by culling the deer population. Deer, it turns out, are extremely destructive to the vegetation which many creatures rely upon. The deer eat the ground vegetation; they eat the tree vegetation. Having fewer deer has meant that the ground and tree vegetation has returned, along with all the creatures that used to be prevalent. Watch the video and see if it doesn't make a difference to you how you feel about wolves.
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