This Primate Probably Has A Better Facial Hair Than Most Of You, Meet The Emperor Tamarin. Native To The Southwest Amazon Basin, they are New World Monkeys that Can reach up to 26 cm or 10 inches, and weigh up to 100 grams. Allegedly, they are named after the German Emperor, Wilhelm II, due to their resemblance. Identified by their small body, they are omnivores, with A diet primarily consists of tree sap and Nectar, but also known to eat insects and small mammals