When amateur naturalist Ted Barber set a camera trap to find out what was taking fish from his pond, he never expected to make a new scientific discovery about otters.
The film shows an otter caching its pray to be eaten some time later, there is also some evidence that the fish we're being kept alive, behaviour never seen in otters, and live caching, unknown in all wild mammals.
Wildlife artist and writer Ben Waddams went to find out more.