I've only seen one and that was 27 years ago , I was lying low with my lurcher , on the bank of stream waiting for the farmer to drive by on the other side of the field . When I see a bit of movement , at first I thought it was a hare but it was an otter, she just went along the sheep fencing that separated the field from the bank then dropped down the bank and away she went . The one and only time I seen one , was worth it though !