Greater one-horned Rhinoceros (Rhinoceros unicornis) is now found exclusively in Nepal and North Eastern India. Being one of the endangered species of the world, it is necessary to develop the proper strategy for its conservation focussing on various aspects of management. Among them, strategy related to food management is pivotal. This study helps to identify the fodder species most preferred by Rhinoceros during monsoon season along with their nutritional composition ( T.Ash, OM, CP, NDF, ADF, ADl, HC, Cellulose, Calcium, EE and Energy. The result of this study is important for management and conservation of this wonderful but extincting creature of this world as more cautionary action can be taken to flourish the food species having more nutrient content in their habitat.