Chinchillas are either of two species of crepuscular rodents of the parvorder Caviomorpha. If it is identified, then all chinchillas in the community should be treated. Hygiene standards should be raised during treatment and subsequently.. - Chinchillas are medium sized rodents native to the Andes mountains in South America. Chinchillas are named after the tribe that hunted the .2004a . Both species of Chinchilla are now considered to be endangered in the wild . If it is identified then all chinchillas in the community should be treated..