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
Montane guinea pig differently pigmented version of "Cavia porcellus", and the second, a wild Peruvian guinea pig that was clearly different from the animal Bennett described. In 1867, Leopold Fitzinger renamed the latter guinea pig "Cavia tschudii". The montane guinea pig is a medium-sized species, growing to a total length of . The colour varies in different parts of the range; in Peru, the dorsal fur is dark reddish-brown mixed with black, and the underparts are dark buffy-grey; in Chile, the dorsal surface is pale agouti brown with paler underparts; in Bolivia, the upper parts are agouti olive and the underparts creamy-white or