The release of gas from the intestines through the anus, made up of gases from digestion and swallowed air, mainly nitrogen, hydrogen, carbon dioxide, and methane.
Sloths were believed to be the only mammals that don't fart—the theory was that methane from digestion was reabsorbed into the bloodstream and exhaled orally. In 2025, a viral video of a sloth farting in a warm bath debunked this myth for good.