Patagonian maras are found only in Argentina, from 28 to 50°S. They prefer to live in habitats with shrub cover, but they also inhabit overgrazed and barren soils in the Monte Desert biome. In northwestern Argentina, they primarily inhabit lowland habitats such as forest and creosote bush or larrea. Maras prefer sandy and low shrub habitat in Valdes Peninsula. They have adapted well to a cursorial lifestyle on the open plains and steppe, with long legs, reduced clavicle, and well-developed sensory organs making them capable of running and communicating in these open habitats. When running, maras have been compared to deer and antelope. Maras are largely herbivorous. They feed primarily on green vegetation and fruit. In the Monte Desert, monocots make up 70% of their diet, while dicots make up 30%. Preferred grass species eaten are those of the genera Chloris, Pappophorum, and Trichloris, while dicots that are eaten include Atriplex lampa, Lycium spp. , and Prosopis spp.