This is almost but not quite the shot I was going for. When I first saw this little beetle it was oriented toward the freshly eaten patch. With the frass strewn around, you can just imagine it chewing away at the surface in a circular pattern. I wasn’t quite stealthy enough in my approach however, and I spooked it into moving away.
Below is a similar beetle, perhaps a different sex of the same species. Note the difference between the freshly eaten patch above and the older ones below.