Central American Squirrel Monkey, Costa RicaSquirrel monkeys are the smallest of the four species of monkey found in Costa Rica. I was down on the Osa Peninsula near the Panama border when a troop of these little guys came for a visit — eager to feast on the red berries that were ripening on the local trees. Nikon D200 with Nikkor 70-200mm lens (at 175mm) ISO 400, f/4 at 1/180th of a second.