Saving a Species: Gorillas on the Brink: Actress Natalie Portman and renowned animal expert Jack Hanna delve deep into the rain forests of central Africa in search of the legendary and endangered mountain gorilla. With compelling footage of the gorillas in their jungle home, this episode of Animal Planet's Emmy Award-winning "Saving a Species" series is a striking and sobering assessment of the habits and habitats of one of the world's most fascinating animals.