Seed dispersal is one of the important factors influencing the spatial distribution and dynamics of plant communities. It can have impacts on many key aspects of plant ecology including regeneration and species diversity, and species invasion and movements across space and time. Seed dispersal is particularly important in arid ecosystems for the dynamics of vegetation. In these areas many species produce seeds to regenerate through sexual reproduction, hence, seed dispersal from distant seed sources by herbivores can play a significant role in the dynamics and persistence of vegetation communities. In this study, the potential for seed dispersal through endozoochory by native herbivores (including Persian wild ass or onager Equus hemionus , wild goat Capra aegagrus , wild sheep Ovies orientalis , and Jebeer gazelle Gazella bennettii of Qatrouiyeh National Park were studied. Dung samples were collected from main habitats of each species across the study area in three seasons (spring, summer and fall). For onager a total of 90 samples and for each of wild goat, wild sheep and jebeer gazelle 40 samples were collected in each season. Dung samples were cultivated in a green house. For onager, a total of 43 plant species (20, 16 and 36 species from August, December and June samples, respectively) from 30 genus and 16 families germinated from dung samples. For wild got a total of 28 plant species (21, 12 and 14 species from August, December and June samples, respectively) from 24 genus and 12 families germinated from dung samples. For wild sheep a total of 34 plant species (17, 13 and 24 species from August, December and June samples, respectively) from 27 genus and 13 families germinated from dung samples. For jebeer gazelle a total of 22 plant species (14, 9 and 11 species from August, December and June samples, respectively) from 18 genus and11families germinated from dung samples. Lepidium vesicarium (Brassicaceae), Astragalus podolobus (Fabaceae) and Cynodon -dactylon (Poaceae) were the most abundant plant species germinated from August, December and June samples, respectively. Forbs were the most abundant vegetative form germinated from the dung of the four herbivore species. Significant differences between seed composition of all herbivores was obtained through a DCA analysis. Jaccard similarity index was highest between plant species germinated from dung of jebeer gazelle and wild got and was lowest between jebeer gazelle and onager. Keywords : Endozoochory, huge herbivores, Nich , arid ecosystems, germination