Animal adapted to subsist solely on plant tissues.
Herbivores range from insects (e.g., aphids) to large mammals (e.g., elephants), but the term is most often applied to ruminants , the ever-growing incisor teeth of rodents , and the specialized grinding molars of cattle, sheep, and goats. Certain herbivores eat only one type of food (e.g., the {{link=koala">koala ), but most have at least moderate variety in their diet.