Amphibians and reptiles ruled the world for nearly 200 million years, and today there are well over 14,000 species. Ranging from some of the largest, most deadly creatures on Earth to the smallest and strangest, these are some of the most fascinating and dramatic animals on the planet...With breathtaking footage and amazing action photography that proves the cold-blooded world is as passionate, dramatic and bizarre as any on Earth, this definitive series reveals the secrets of the most successful creatures ever to walk - or crawl - on land.