Herbivores are animals that primarily eat plants. They have evolved specialized digestive systems and teeth to break down plant matter, which is often tough and fibrous.

Here are some key characteristics of herbivores:

* Diet: Their diet consists mainly of plants like grasses, leaves, fruits, vegetables, seeds, and nuts.

* Digestive System: Many herbivores have long digestive tracts to allow more time for digestion and have symbiotic relationships with bacteria that help break down cellulose.

* Teeth: Herbivores have teeth adapted for grinding and tearing plant material. They often have wide, flat molars and incisors for biting off plant matter.

* Examples: Some examples of herbivores include cows, deer, rabbits, elephants, giraffes, and horses.

There are different categories of herbivores based on their diet:

* Grazers: Primarily eat grasses (e.g., cows, horses, zebras)

* Browsers: Primarily eat leaves, shoots, and twigs (e.g., deer, giraffes)

* Frugivores: Primarily eat fruits (e.g., monkeys, bats)

* Granivores: Primarily eat seeds (e.g., squirrels, birds)

Herbivores play a vital role in the ecosystem by converting plant matter into energy for other animals and contributing to nutrient cycling.