Panamanian Night Monkey, Soberania National Park, PanamaI photographed an Azara’s night monkey years ago in Bolivia. These two guys are believed to be either a subspecies or a different species all together, depending on who you talk to. All night monkeys are of the genus Aotus, but there are several different subspecies split across two groups, the red-necked and the gray-necked. The Panamanian night monkeys fall under the gray-necked group. As the name would suggest, they are strictly nocturnal. I took this shot just before sunset, and the monkeys seemed to be about ready to leave their daytime resting spot and head out for the night. One interesting fact about night monkeys is that they are one of the few mammals affected by the malaria virus and are therefore useful in malaria research.
Nikon D810 with Nikkor 200-400mm lens (at 400mm) ISO 1600, f/9 at 1/15th of a second, two Nikon SB-900 flash units