Crocodiles: Explore Africa's Grumeti River in Tanzania, where the powerful crocodile - often called the last surviving giant of the dinosaur age - dominates the waterway with its huge tail and crushing jaws.

Tale of the African tides: Two very different worlds collide where the Indian Ocean meets the north-eastern coast of Kenya, as tiger sharks, humpback whales and coral reefs coexist with a host of African land animals taking advantage of the coastal riches.