The Punta de Vacas chinchilla rat (Abrocoma vaccarum), also known as the Mendozan chinchilla rat, is a species of chinchilla rat in the Abrocomidae family. Found only in Argentina, this species was once thought to be part of the ashy chinchilla rat (Abrocoma cinerea). In 2002, Braun and Mares from the University of Oklahoma confirmed it to be a separate species. This species prefers to live on rocky cliff faces and is found most frequently in an area 1,880 m above sea level.