Saimiri Sciureus, also known as the common squirrel monkey, is a small primate with a distinctive appearance and behavior. Some of the synonyms for Saimiri Sciureus include the Central American squirrel monkey, the South American squirrel monkey, and the tamarin squirrel monkey, among others. They are native to South and Central America and are known for their social behavior and acrobatic abilities. These primates are diurnal, which means that they are active during the day, and are omnivorous, feeding on fruits and insects. Saimiri Sciureus is a popular research animal due to their small size and similarities to human behavior.