There are: workers (sterile females); fertile males; and queens
(fertile females).
The worker ants build and extend the nest, look after larval forms and forage for food, whereby they become pests.
The queens perform none of these duties, but remain almost exclusively
within the nest.

Ants have one of the most varied diets of all insects.
Foraging worker ants cause a nuisance as they travel widely in
search of food, following well-defined trails and clustering around the food source. The gregarious habits of ants have resulted in the development of a caste system, whereby individuals are responsible for specialised duties within the community.