noun which may take the genitive case particle 'no'
herbivorous; graminivorous
Describes an animal that feeds on plants; used attributively with の. 'Graminivorous' is a more specific term for grass-eating, but 'herbivorous' is the common equivalent.
牛は草食性の動物です。
Cows are herbivorous animals.
草食性の恐竜は植物だけを食べていた。
Herbivorous dinosaurs ate only plants.