The term 'MONKEY's Uncle' is a phrase used to express surprise or disbelief. The crossword solutions for this term are LEMUR (5 letters), APE (3 letters), ORANG (5 letters), and IMA (3 letters). Lemurs are primates native to Madagascar, and they are closely related to monkeys. Apes are a type of primate that includes gorillas, chimpanzees, and orangutans. Orangutans are an endangered species of great APE found in the rainforests of Borneo and Sumatra. IMA is an acronym for International MONKEY Association, which is an organization dedicated to protecting the rights of primates.