In Mexico's far south lies an unusual peninsula: The Yucatan. Swathed in a forest stretching 50000 square miles and once ruled by the mighty Maya Civilization. But it's also place full of secrets which hold the key to how animals and people survive the long and difficult times. This is where we begin our journey through the seasons. A young morelet crocodile searches for prey in one of only a few places left with water. Thirst even lures the most elusive forest creature -- the Jaguar. Above in the canopy, spider monkeys are on the search for food, and there's no better place to find it than at the spectacular Maya temple of Calakmul.