The Living Edens Episodes on PBS

“Kakadu: Australia's Ancient Wilderness” surveys the wildlife in this 8000-square-mile national park. The “lord of the wetland,” says narrator Peter Coyote, is the saltwater crocodile, the “largest and most aggressive survivor of the age of dinosaurs.” Crocs and their potential meals are followed for a year's six seasons in this hour, which also checks out boxing wallabies, frill-necked lizards and magpie geese, which mate for life---in threesomes (one male and two females).