In the Grand Canyon, Woodpeckers store their food in hollowed out holes in trees, but when a squirrel tries to steal the supply - they defend their stockpile.
An international team of scientists and explorers, lead by Dr Julian Bayliss, go on an extraordinary mission in Mozambique to reach a forest that no human has set foot in.
Abandoned houses hide beneath blankets of vines in the former fishing village of Houtouwan, on Shengshan, one of hundreds of islands in China's Hangzhou Bay.