In episode three, Steve travels to Mexico, where he starts his journey outside the city of Valladolid, on the vast Yucatan Peninsula, a part of Mexico that was only accessible by sea until the 1950s. It's here he's hoping to find one of the most dangerous snakes in Mexico: the rattlesnake.

This week he explores the wildlife in the stunning landscapes of Namibia. In the bush he tracks two hungry cheetahs as they hunt; he stakes out a carcass to get up close to vultures and he has a close call with an agitated lion as he helps a vet at work.