In this model food web, one animal is described as eating only grass, leaves and seeds, and never eating other animals. Which role fits this animal?

Explanation

An animal that eats only plant material feeds directly on the plants at the base of the web, which makes it a primary consumer, also called a herbivore. The role one level higher fails here, because that role requires eating animals that themselves fed on plants, and this animal eats no animals at all.