Herbivores are the organisms that are adopted to eat plants. Harbivory is a form of predation in which organisms consume autotrophs. i.e. in this context Harbivory refers to animals eating plants.Cellulase due to its massive applicability has been used in various industrial processes such as biofuels like bioethanol, triphasic biomethanation; agricultural and plant waste management ; chiral separation and ligand binding studies. The cellulase is used for many industrially important processes like commercial food processing in coffee, brewery, wineries, and textile and paper industries.Cellulases that catalyzed the hydrolysis of cellulose, it is produced mainly by symbiotic bacteria in the rumen of ruminants.In present studies the cellulases producers isolated from fecal matter of deer and elephant by serial dilution technique and producers are screened on CMC (Carboxy Methyl Cellulose) media.The present work concentrates on the isolation of cellulose-degrading bacteria from herbivores excreata and assessment of their cellulolytic activity. The coculturing of cellulose-degrading bacteria and yeast was also carried out for simultaneous saccharification and fermentation of cellulose into ethanol.