Learn about biodiversity in this clip from Gorongosa Park: Rebirth of Paradise. Gorongosa's is attracting scientists from around the world to understand what happens to an ecosystem when it loses most of its big grazers. Harvard insect expert, Piotr Naskrecki is looking to the micro scale for answers. While sweeping the grasses with his net he discovers a surprising hero that kept Gorongosa alive after the war. Bob learns for Gorongosa to heal it needs all the players, big and small.