The term RAINFOREST DENIZEN can be summarized as an animal that lives in a rainforest, with the crossword solution being APE. Apes are a type of primate that live in tropical and subtropical climates, such as rainforests. They are highly intelligent and social animals, and are known for their ability to use tools. There are several species of apes, including gorillas, chimpanzees, orangutans, gibbons, and bonobos.