Capuchin monkeys were small, agile Monkeys that rarely grew taller than 20 inches (50 centimeters) and weighed between 3 and 9 pounds (1.5–4 kilograms). They had dark fur over most of their bodies, with lighter faces and distinctive tufts that gave them a curious appearance. Capuchins were highly intelligent and social, living in small bands and often observed using simple tools to access food.
They foraged for fruits, insects, and small vertebrates, moving nimbly through the canopy with an almost preternatural awareness of their surroundings. Despite their size, they could be fierce when defending their territory, and their sharp teeth and quick reflexes made them formidable opponents to predators and rival groups.
Capuchin monkeys were sometimes referred to as "organ-grinding monkeys"; it was common for them to be employed by Human street performers, circuses, and traveling Bards. They would turn a simple musical instrument, allowing their performing partner to deliver a show to its time.