Abrocoma Cuscomys †Protabrocoma Chinchilla rats or chinchillones are rodents of the family Abrocomidae.

They resemble chinchillas in appearance, with a similar soft fur and silvery-grey color, but have a body structure more like a short-tailed rat.

They are social, tunnel-dwelling animals, and live in the Andes Mountains of South America.

[2] Some molecular work[3] suggests that, despite their appearance, they may be more closely related to octodontoids such as degus, nutria, and tuco-tucos than they are to chinchillas and viscachas.

The family name is derived from the Ancient Greek word ἁβροκόμης (habrokomēs, "with delicate hair").