The Degu (Octodon degus) is a small caviomorph rodent that is native to Chile. It is sometimes referred to as the Brush-Tailed Rat (although not closely related to the rat family) 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. Degus are closely related to the chinchilla and guinea pig, also placed in parvorder Caviomorpha.

Degus are highly social. They live in burrows, and, by digging communally, they are able to construct larger and more elaborate burrows than they could on their own. Degus digging together coordinate their activities, forming digging chains.

Females living in the same group have been shown to spontaneously nest communally; they nurse one another's young. They spend a large amount of time on the surface, where they forage for food. When foraging, their ability to detect predators is increased in larger groups, and each animal needs to spend less time in vigilance.

Degus exhibit a wide array of communication techniques. They have an elaborate vocal repertoire, and the young need to be able to hear their mother's calls if the emotional systems in their brains are to develop properly. They use their urine to scent mark, and experiments have shown that they react to one another's marks.

Degus are seasonal breeders; the breeding season for wild degus begins in the Chilean winter, with pups born mid-late spring. It is also speculated that female degus are induced ovulators. Female degus are pregnant for approximately ninety days, having a long gestation period compared to other rodents such as hamsters.

Litters usually contain four to seven pups, but size can range from one or two up to fifteen young. Degu pups are born relatively precocial, fully furred and with eyes open, and their auditory and visual systems are functional at birth.

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