Japan's 'big island' is home to millions of people - and an astonishing range of wildlife.

In the far south of Japan, there is a chain of islands stretching towards the tropics - a place where all life is influenced by the power of the sea, and where volcanoes and typhoons are forces to be reckoned with.

The northern island of Hokkaido swings from Siberia-like winters to Mediterranean-like summers. Everything living on Japan's wildest island needs to be extra resilient to survive.