Mexico: Earth's Festival of Life

The first of three programmes about the wildlife, landscape and culture in different areas of the country explores the Sierra Madre mountains, and reveals how this rugged landscape has shaped the nation. This chain of peaks includes several volcanoes and is home to a wide variety of animals, including black bears, monarch butterflies, orchid bees and quetzals. The programme also visits the ruins of an ancient Aztec shrine and the blue agave plant which grows in the mountains is used in making tequila