Levison Wood reaches the final stage of his epic 650-mile journey, following the annual migration of Botswana's 130,000 elephants. Together with his guide Kane, Lev follows the elephants deep into the heart of the Okavango Delta, a vast wetland teaming with wildlife where every year more than 40,000 elephants gather to feed. Lev and Kane narrowly avoid a pride of lions who have brought down a male buffalo and watch as they move in for the kill, but are forced to wade through wide channels where crocodiles, hippos and snakes lurk.