Nests

Ants are one of the few groups of animals which modify their immediate environment to suit their needs. They build often elaborate nests in a range of situations, sometimes expending huge amounts of energy in their construction. These nests are commonly occupied for years and some for decades. In addition, some ants use plant fibres or soil to construct protective coverings over nests and feeding areas. Only a handful of animals manufacture such elaborate and complex structures.

Nests in soil vary from small, simple chambers under rocks, logs or other objects on the ground to extensive excavations extending a meter or more into the soil. The exact structure of the nest varies with the species, soil type and situation. The entrances to these subterranean nests show a wide range of styles. Many are no more than a cryptic hole just large enough for a single worker to squeeze through. Others are a single entrance surrounded by soil which varies from a low and broad mound to a tall, narrow turret. A number of species assemble soil and leaves around their nest entrances to form large piles with well-defined, vertical sides and concave tops. Others collect plant material to construct thatched mounds above their subterranean nests.

While many ants form elaborate nests, those of other species are relatively simple. Many of the species found in rotten wood do little more than remove loose wood fibres to construct simple chambers for workers and brood. These chambers can be small or very extensive but often lack the complexities of nests found in soil or arboreally. Finally, a handful of species (for example some Leptogenys) lack what would normally be thought of as a nest and are found in small groups clustered on the ground in leaf litter or among the roots of plants. These species move their "nests" frequently and can be found in a wide range of suitable sites.