Goats are herbivores, which means they eat only plants. Their favorite food is grass. They are selective in what they eat, choosing clean dry food over dirty, wet food. Goats do not have upper teeth, but they have a tough upper pad in their mouth that helps with chewing. Their lips are sensitive and agile, allowing them to nibble on fresh, tender grasses.
Goats are ruminants, hoofed herbivorous grazing animals, most having a four-chambered stomach, to maximize absorption and digestion of nutrients. The first three stomachs are for fermentation, while the last one produces acid for digestion.
Ruminating mammals include cattle, sheep, giraffes, deer, gazelles and antelopes. (Camels and Chevrotains have a three-chambered stomach and are referred to as pseudo ruminants.)
Goats, like sheep, have rectangular pupils that allow them to see about 340 degrees (almost all the way) around them, providing a panoramic vision which can detect intruders approaching from various directions