He tracks at every step. Every mark in the dirt says something to him. He can tell from the stride what amimal has passed without a definable mark then a few paces on in a wet creek where a track is readable he is right. A few light paralell marks in the snow, a slight scuff, mouse tracks end. He knows an owl has picked up a mouse. He guesses where the owl took the kill where we find recent perching and a casting with mouse bones.