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
Greater guinea pig Greater guinea pig The greater guinea pig, "Cavia magna", is a species of rodent found in the coastal strip of Brazil and Uruguay, where it lives in moist grassland and marshes. A large rodent, the greater guinea pig grows to a total length of and weight of for males and a total length of and weight of for females. The dorsal fur is dark agouti brown and the underparts are reddish brown. It is semiaquatic and has membranes joining the toes. Its karyotype has 2n = 64 and FN = 128. This species is native to the coastal strip of