The term 'chest beater' refers to an animal that uses its chest to make a loud sound. The crossword solutions for this term are GORILLA (7 letters), APE (3 letters), and HEART (5 letters). Gorillas are the largest of the great apes, and they use their chests to beat out loud sounds as a form of communication. Apes are a group of primates that includes gorillas, chimpanzees, and orangutans, and they also use chest beating as a form of communication. Finally, the HEART is a vital organ in the human body that pumps blood throughout the body. It is not used for chest beating, but it is a necessary part of life.