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In the semiarid Monte desert, Rio Negro province, the mara (Dolichotis patagonum) and the European hare (Lepus europaeus), which was introduced about hundred years ago, today occur sympatrically, as in many regions of Argentina, The forage use of these herbivores was determined hy fecal analysis in older to estimate food partitioning and the presumed interspecific nutritional competition. Microhistological analysis of the fecal plant remnants collected at three study sites proved a high overall similarly in diet for both species, primarily based on shrub consumption during summer and winter. However, annual and perennial grasses and forbs were also foraged, especially ill spring. Though a trophic niche overlap of about 50% was calculated, ir remains doubtful if the introduced hare has diminished the mara population.