The BBC's latest nature documentary follows the adventures of some of the largest and most mysterious animals on our planet - whales and dolphins. Oceans Giants is a three part series which explores the magical world of whales and dolphins, uncovering the secrets of their intimate lives as never before seen. The short clip below is a snippet from episode 1, Giant Lives, which was aired last Sunday. Narrated by Stephen Fry, the series not only gives us an insight into the lives of the whales and dolphins but also into the work of the scientists studying these magical creatures. The series continues tomorrow on BBC One and BBC HD at 9:00pm. For more information on Ocean Giants visit the BBC website.