Scat on my deck
Was it a deer who left this scat on my deck? Some of it looks like deer pellets, but not all of it. Also seems like it would be very awkward for a deer to get it this close to a wall and a bench at a right angle to that wall.
Your photo was a bit blurry so it is hard to say what scat this is. It is very possible it is from a deer especially if there are plants on your deck that they are interested in. Deer scat is not always in pellet form.
The following is a link to a scat identifier website, http://icwdm.org/Inspection/Scat.aspx