The annual flood arrives in the Okavango Delta, bringing new prey and challenges for the big cats. Gordon Buchanan follows the hungry lion mothers as they hunt buffalo, while eldest cub Mathata learns to avoid this formidable prey. Anna Dimitriadis tracks a skinny young cheetah struggling to catch food in the changing landscape and Brad Bestelink follows a pregnant leopard looking for a den as rising flood waters push dangerous males into her territory