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Related to Chinchillidae: chinchilla
a family of mammals of the order Rodentia. The body length is 22–66 cm; the tail length is 7–32 cm. The family consists of three genera— Chinchilla, Lagostomus (with one species, the viscacha), and Lagidium. The animals, which inhabit South America, are commercially valuable. Their number is decreasing, but they are now protected animals.