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… regulations and a decline in mercury air emissions. The reintroduction of grey wolves to Yellowstone National Park is … 3: Wolves improve ecological balance in Yellowstone The reintroduction of grey wolves (Canis lupus) to Yellowstone … to study and document the dramatic effects that reintroduction of a key predator species can have upon an …

… to its purchase in 1974. It has had a lion and white rhino reintroduction programme, and is now used for big game …