Probably no other sea animal has captured our affection and attention like the dolphin. Its intelligence and athleticism has fascinated observers for years. Dolphins seem to exhibit a friendly willingness to co-operate with humans...something very rare in the wild animal kingdom.

Barely visible to the human eye, a truly fascinating universe lives in the bush and savannas of Africa. Here, creatures small, smaller and nearly invisible share a world with gigantic animals. Usually overlooked, often feared and despised, theirs may be a small world, but it's an important one.

Peer through the lenses of some of the world's most celebrated nature and wildlife photographers and descend into the Amiga River Basin, the largest rain forest on earth. Pulsing through the center of these pristine tropics is the Rio Negro, also known as the Golden River, containing the purest water on the planet as well as a spectacular array of aquatic life. Narrator Grant Goodeve lets you in on some of its most amazing secrets.