Dr Dawson, from the University of Sheffield, who led the study, said the footage shows the animals sniffing for spraints (droppings) left by other otters - which locates their presence.

8 shows the otter poop, also known as spraint, found on Lantau Island. It looks almost like gray sawdust. Eurasian otters, also known as European otters or Lutra lutra, are a widespread species ...