There are carnivorous meat eaters and herbivorous plant eaters. Food habits range from strictly carnivorous to strictly herbivorous. Dinocephalians included herbivorous, carnivorous, and omnivorous forms. They include carnivorous, herbivorous, and omnivorous forms. There is a plethora of both herbivorous and carnivorous reptile fossils. The red squirrel is an arboreal, primarily herbivorous rodent. They have highly specialized rasping mouth parts suitable for herbivorous, omnivorous or planktivorous diets. It is a diurnal, arboreal, and mainly herbivorous squirrel. Oviraptoridae is a group of bird-like, herbivorous and omnivorous maniraptoran dinosaurs. This includes the development and growth of carnivorous and herbivorous species. Wombats release less than other herbivorous mammals. The teeth also suggest that "Pakicetus" had herbivorous and omnivorous ancestors. The dugong is the only strictly herbivorous marine mammal. Chilesaurus is an extinct genus of herbivorous dinosaur. There is plentiful evidence for gregarious behaviour among herbivorous dinosaurs, including ceratopsians and hadrosaurs.