PBS | 9:00 pm

Actor Michael C. Hall narrates the new special "Nature's Fear Factor," which examines how an audacious wildlife recovery effort in Africa is using fear of predators to re-balance the ecosystem in Mozambique's Gorongosa National Park. A violent period of civil war wiped out more than 90 percent of the large mammals in this region, and subsequent species recovery has been erratic and uneven. Predator experts are re-introducing fierce African wild dogs into the park to scare smaller plant-eating prey back into their natural balance.