Linnaeus's Mouse Opossum, BoliviaThis one goes back to 2008 when I traveled to the Pampas region of Bolivia. It’s difficult to make an exact identification as there are multiple species of mouse opossum, but I believe this to be the Linnaeus’s mouse opossum — a nocturnal marsupial I spotted on a night hike. Nikon D300 with Nikkor 200-400mm lens (at 260mm) ISO 200, f/6.3 at 1/60th of a second.