Adult goats are herbivorous ruminants. The mouth, oesophagus, four stomach compartments, small intestine, cecum, and large intestine are all present in their digestive tracts, similar to those of cattle, sheep, deer, elk, bison, and giraffes. These creatures ruminate or chew the cud. They, unlike us, have four-compartments in their stomachs. Their stomachs are specifically designed to digest roughage (food high in fibre) such as grass, hay, and silage. The goat's stomach is divided into four chambers: the rumen, the honeycombed reticulum, the omasum, the abomasum, or the true stomach. As the animal grows, the size of the four chambers changes. The abomasum shrinks proportionally.