Unlike its relatives, which include otters and pine martens, stoats leave few obvious field signs such as footprints, fur or scats (carnivore droppings), which makes it harder to study.

Pine martens have a long fluffy tail ... They are larger than stoats and weasels, and have longer tails and legs than polecats.

Pine martens have a long fluffy tail ... They are larger than stoats and weasels, and have longer tails and legs than polecats. What are these? Try one of the walks from Derek's latest walking ...