What type of animals are commonly herbivores?

Herbivores are animals that primarily consume plants as their main source of food. The correct answer highlights that insects and reptiles are commonly herbivores. Many insects, such as grasshoppers and caterpillars, typically feed on a variety of plant materials, making them significant herbivores in various ecosystems. Similarly, certain reptiles, like iguanas and some tortoises, also predominantly eat plant matter, including leaves, fruits, and flowers.

In contrast, the other options contain categories of organisms that do not commonly represent herbivores. Carnivores, for instance, are animals that primarily eat other animals. While mammals include species that can be herbivorous, carnivorous, and omnivorous, not all mammals are herbivores. Fungi and bacteria are not animals; they are decomposers or microorganisms that obtain nutrients in different ways, but they are not classified as herbivores. Therefore, focusing on insects and reptiles provides a more accurate representation of commonly found herbivores.