Grazing animals like cattle, goat and deer are common in grassland. These animals are called the ruminants which are the herbivores with diet consisting of eating large amounts of roughage or the fiber. They have evolved digestive system to digest the bulky cellulose. The adaptation in them is the presence of the multi-chambered stomach. There are four compartments in the stomach of these animals called the rumen, reticulum, omasum and the abomasum. This provides larger space and contains microbes aiding the digestion of cellulose. The abomasum is the true stomach equivalent to the monogastric stomach chamber where gastric juices are secreted.
