Kate Humble and Simon King report from Zambia, following the lives of the animals living along the Luangwa River at a critical time in the seasons. It's been the longest dry season in living memory but the rains have finally come and now everything has changed. Thirst has trapped the elephants, buffalo and antelope close to the river where they've been easy prey for the lions, leopards and wild dogs. But now the grazing animals can spread out across the valley and the predators are going to have to work a whole lot harder for their food.