Gopher snake (Los Trancos OSP). Notice the oscillating highlight squiggles on the tongue, which are well worth looking at in higher magnification. Not entirely sure what's going on. The shutter speed was 1/100 s, and I used fill flash (probably < 1/1000 s). Maybe the oscillations are the position of a highlight on the tongue during a tongue-flicker on the time scale of the shutter opening.