Here's a few from when I've been out surveying.
Track - hind pad inlaid on the fore.
Attachment 1955
Bit scratchy this photo - 2 fore pads. I was hunched under a bridge and in poor light so tried to use a torch in one hand and camera in the other.
Attachment 1958
Spraint on rock - fish diet.
Attachment 1957
Spraint on rock - crayfish diet.
Attachment 1959
Close up - very red in colour.
Attachment 1956