What do they call an animal that only eats ants?

There isn't a specific word for an animal that *only* eats ants. However, there are several terms that describe animals that primarily eat ants:

* Myrmecophagous: This is the most common term used for animals that eat ants. It comes from the Greek words "myrmex" (ant) and "phagein" (to eat).

* Ant-eating: This is a more straightforward and descriptive term.

* Myrmecophage: This is the noun form of "myrmecophagous," referring to an animal that eats ants.

Keep in mind that many animals might eat ants occasionally, but they aren't considered myrmecophagous unless ants make up a significant portion of their diet. Some famous examples of myrmecophagous animals include anteaters, aardvarks, and pangolins.