Nancy Ma's Night Monkey, PeruThis is a Nancy Ma’s night monkey, named after a Harvard professor. We were out on the river at night in Loreto, Peru, in the northern Amazon basin when we saw those eyes staring back at us. Nikon D500 with Nikkor 500mm PF lens, ISO 800, f/7.1 at 1/200th of a second, Godox V860iii flash.