I'd like to know any idea about that too, saw one like tat a couple of years ago WHICH reminds me, saw a dead shrew on the path yesterday which happens a lot and I bet to lots of other people too - I have always assumed these are fresh kills which the predators have abandoned at the sound of galloping fell shoes. Oh and - saw a roe (think) deer too, near the Lad's Leap route looked at me for a bit then leaped away through the bracken. Wish I could jump like that.