The degu (Octodon degus, /ˈdeɪɡuː/) is a small caviomorph rodent that is endemic to the Chilean matorral ecoregion of central Chile.It is sometimes referred to as the brush-tailed rat, and is also called the common degu, to distinguish it from the other members of the genus Octodon. Other members are also called degus, but they are distinguished by additional names. The name "degu" on its own, however, indicates either the genus Octodon or, more usually, O. degus.