Leaf cutters! 

The dream species of many ant keepers.
A species that is also frequently shown on TV, for example in BBC documentaries (David Attenborough). A very recognizable species, and the most recognizable feature is that they walk back to their nest with leaves. To successfully keep leaf cutters, a number of things are very important, especially the right temperature and humidity. But evolving the setup as they grow is also very essential for success. A leafcutter colony takes about 20 months to reach maturity.
Leafcutters are also polymorphic, meaning they have workers in different sizes.
(regular workers, mediums, and majors/soldiers). Keeping leafcutters is quite different from other ant species, mainly due to the setup requirements.
Leaf cutters use the leaves to cultivate a fungus, the colony lives in and around this fungus.

Note: when purchasing a leaf cutter colony you will also receive an extensive care sheet.