Yellow-Crowned Brush-Tailed Rat, Loreto, PeruThese tree rats are nocturnal, but this one opened his eyes to get a look at us as we floated past on a tributary of the Amazon River in northern Peru. Nikon D500 with Nikkor 500mm PF lens, ISO 800, f/5.6 at 1/60th of a second, Godox V860iii fill flash.