Macaca radiata is a species of macaque, also known as the bonnet macaque or zati. This primate is native to South India and Sri Lanka and is characterized by its distinctive grey-brown fur, bare pink face, and long tail. In addition to its scientific name, the bonnet macaque is also referred to by several other synonyms such as Cynomolgus radiatus, Macaca radiatus, Cynopithecus radiatus, and Radiated Macaque. These synonyms denote the same species of macaque but are different names used by researchers and scholars in different parts of the world. The bonnet macaque is a fascinating species and has been the subject of numerous studies in primate behavior and cognition.