Herbivores don't only eat plants. They primarily eat plants, but they can sometimes consume other things, too! Here's why:

* Physiological Adaptations: Herbivores have evolved digestive systems specialized for breaking down plant matter, which is tough and fibrous. They have longer intestines, different types of bacteria in their gut, and stronger teeth for grinding.

* Nutritional Needs: Plants are a good source of energy and nutrients like carbohydrates, vitamins, and minerals for herbivores.

* Food Availability: Plants are abundant in many environments, making them a readily available food source.

However, some herbivores may occasionally consume other things like:

* Insects: Some herbivores, like deer, may eat insects for extra protein.

* Small Animals: Some herbivores, like antelopes, may occasionally eat small animals if they encounter them.

* Soil: Herbivores, especially those that eat grasses, may eat soil to obtain minerals.

* Bones: Some herbivores, like giraffes, may chew on bones for minerals.

So, while herbivores are known for their plant-based diets, their dietary habits are not always strictly limited to just plants.