Cercopithecoids are a group of Old World monkeys that include baboons, macaques, and colobus monkeys. The term cercopithecoids comes from the Greek words kerkos meaning tail and pithekos meaning ape. There are several synonyms for this word, including cercopithecid, cercopithecid monkey, and cercopithecine. These terms are used interchangeably to describe the same group of primates. Cercopithecoids are known for their complex social structures, dexterous hands and feet, and striking physical appearances. These monkeys are found in a variety of habitats across Africa and Asia, and have adapted to thrive in both tropical forests and arid savannas.