In Greater Yellowstone, for example, Predator Project found that more than two-thirds (22 out of 30) of the human-caused mortalities of the Yellowstone wolves have occurred outside of the national park, even though the wolves have spent the majority of their lives within the park's borders.

CNN: Northern Rockies wolf report released

Predator Project found that wolves rarely survive outside of the three core recovery areas: Yellowstone National Park, central Idaho and Northwest Montana.

CNN: Northern Rockies wolf report released