Diving to depths of around 20 metres, sea otters can access all kinds of food but they often need the help of their favourite rock to crack open their catch.

After a deadly fungus spread through the rainforests in southern Chile, conservationists embarked on a rescue mission to save Darwin's frog.

Sixty-two years after Attenborough's long-beaked echidna was last scientifically recorded, Expedition Cyclops went on a mission to find out whether the species still exists in the Cyclops Mountains.