Just two years after gray wolves were reintroduced to Yellowstone after what is believed to have been half a century's absence, they have dramatically made their presence felt. They have killed half
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/2-years-wolves-reshape-yellowstone
[2] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife