Brown Capuchin Monkey, Piaui, BrazilThe capuchin monkeys in this section of northeastern Brazil are nicknamed Einstein monkeys for their ability to use tools to crack open pine nuts. This particular Einstein monkey was taking a break from that particular task and relaxing in the shade of a tree. Nikon D300 with Nikkor 200-400mm lens (at 210mm) ISO 800, f/4 at 1/1600th of a second.