Borborygmus (pronounced /ˌbɔrbəˈrɪɡməs/; plural borborygmi) is a rumbling or gurgling noise that occurs from the movements of fluid and gas in the intestines. This process occurs in some animals, including humans. The sound occurs when gases in the body flow through the small intestine. As waves of muscle contractions move foods and gases through the digestive system, the food is pushed against the intestinal wall, which induces the noise. The process of these contractions is also known as peristalsis, which is the ultimate cause of borborygmus.