Chacoan mara the capybara, and guinea pigs. Chacoan maras are closely related to the other member of the genus "Dolichotis", the Patagonian mara. Maras are the fourth largest rodent in the world after the capybaras, beavers and porcupines . Though the mara may look like a rabbit, the rabbit is not actually a rodent and therefore not as closely related to the mara as one might expect. Chacoan mara The Chacoan mara, Dolichotis salinicola, is a relatively large South American rodent of the cavy family. They are a close relative of the better known Patagonian mara. The Chacoan mara lives in the
Guinea pig scientific experimentation, or any experiment or test in modern times. This dates back to the early 20th century; the "Oxford English Dictionary" notes its first usage in this capacity in 1913. In 1933, Consumers Research founders F. J. Schlink and Arthur Kallet wrote a book entitled "100,000,000 Guinea Pigs", extending the metaphor to consumer society. The book became a national bestseller in the United States, thus further popularizing the term, and spurred the growth of the consumer protection movement. During World War II, the plastic surgeon Archibald McIndoe established the Guinea Pig Club at Queen Victoria Hospital, East Grinstead, Sussex,