graminivore

A graminivore is a herbivorous animal that feeds primarily on grass, specifically "true" grasses, plants of the family Poaceae (also known as Graminae). Graminivory is a form of grazing. These herbivorous animals have digestive systems that are adapted to digest large amounts of cellulose, which is abundant in fibrous plant matter and more difficult to break down for many other animals. As such, they have specialized enzymes to aid in digestion and in some cases symbiotic bacteria that live in their digestive track and "assist" with the digestive process through fermentation as the matter travels through the intestines.

Graminivores not only consume grasses, but also sedges. Grasses and sedges are both graminoids. Sedges are a part of the Cyperaceae family. Grasses are hollow with stems jointed and nodes, and typically have a round cross-section. Sedges are either round or triangular in cross section and not hollow.