Grazing has two distinct meanings. First, grazing is a method of feeding in which a herbivore feeds on plants such as grasses, or other multicellular organisms such as algae. Many small selective herbivores follow larger grazers, who skim off the highest, tough growth of plants, exposing tender shoots.hile hippopotamuses rest near each other in the water, grazing is a solitary activity. Their incisors can be as long as 40 cm and the canines up to 50 cm, however, the canines and incisors are used for combat and play no role in feeding.