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Watch Nova Season 47 Episode 15 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

For animals in Mozambique's Gorongosa National Park, the normal balance of competition and predation was upended when a war wiped out the top predators. The remaining animals didn't simply grow in numbers—they began behaving in unusual ways, veering outside their typical territories and feeding patterns. Could it be that it's not just predators' 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 park's "landscape of fear" can restore balance to an entire ecosystem.