Squirrel monkeys are some of the most fascinating and unique primates in the world. They are one of the only primates that exhibit female dominance, meaning that females outrank males in their social groups. They are also one of the few species of monkey to exhibit reversed sexual dimorphism, meaning that males are smaller in size than females. What makes squirrel monkeys so unique, however, is their behavior. They are incredibly playful and curious animals, and they love to explore their surroundings. They are also very vocal and social animals, and they often spend time grooming each other and playing together.