For animals in Mozambiqueโs Gorongosa National Park, the normal balance of competition and predation was upended when a war wiped out the top predators. The remaining animals didnโt simply grow in numbersโthey began behaving in unusual ways, veering outside their typical territories and feeding patterns. Could it be that itโs not just predatorsโ kills that keep other populations in check, but also the fear they inspire? NOVA joins a team of scientists as they reintroduce wild dogs to Gorongosa to find out if restoring the parkโs โlandscape of fearโ can restore balance to an entire ecosystem. (Premiered October 14, 2020)