David Attenborough narrates the story of Rodrigo Medellin, Mexico\\\'s very own \\\'Bat Man\\\'. Since he first kept vampire bats in his bathroom as a child, Rodrigo has dedicated his life to saving them. Now Mexico\\\'s most famous export, tequila, is at stake.

Caves are remarkable habitats with equally bizarre wildlife. Cave angel fish cling to the walls behind waterfalls with microscopic hooks on their fins. Cave swiftlets navigate by echo-location and build nests out of saliva. The Texas cave salamander has neither eyes nor pigment. Planet Earth gets unique access to a hidden world of stalactites, stalagmites, snotites and troglodytes.