Up until the mid-1990s, the ecosystem of Yellowstone National Park had turned into a gloomy, barren land, overgrazed and overpopulated by elk. But ever since wolves were reintroduced in the park, the ...

It didn't come as a surprise to researchers that the re-introduction of wolves in certain parts of the northern U.S. would reduce deer and elk herds, and thus reduce automobile accidents with those ...