There are deep holes in some plants which are called "domatia" in biological terminology. The only function of these holes is to serve as a shelter for ant colonies. In these plants, there are openings or thin windows of tissue which enable ants to get in and out of the plant easily. In these chambers, there are food bodies that the plant produces with no known function other than the feeding of ants. They do not appear to have a real use for the plant.¹ In short, domatia are very special structures that have been created in order for ants to live. The heat and moisture balance provides an ideal environment for ants. In these places marked by diligence that are prepared for ants, the ants make themselves just as comfortable as people staying at luxury hotels.

1- Bert Hölldobler-Edward O.Wilson, The Ants, Harvard University Press, 1990, p. 534-535.