Leafcutter ant carrying

Leafcutter ants of the genera Atta and Acromyrmex carry leaves to cultivate fungus in their underground nests.

About this subject

Leafcutter ants, belonging to the genera Atta and Acromyrmex, are social insects found from the southern United States to Argentina. They are known for cutting leaf fragments and carrying them to their nests along well-defined trails. This behavior is part of a sophisticated agricultural system: the leaves are not eaten directly but serve as substrate for cultivating a symbiotic fungus, Leucoagaricus gongylophorus.

Inside the nest, smaller workers process the leaves by chewing and mixing them with feces to create fungal gardens. The fungus produces protein- and sugar-rich structures called gongylidia, which serve as food for the colony. This mutualism is essential for both species: the ants depend exclusively on the fungus, and the fungus cannot survive without the ants' care.

Leafcutter ants are ecological engineers. By cutting leaves, they promote soil aeration and nutrient cycling, and create light gaps in the forest understory. A single colony can contain millions of individuals and excavate tunnels up to 8 meters deep. The queen, which can live for over 20 years, is the sole reproductive individual, producing hundreds of sterile worker daughters throughout her life.

A remarkable fact is the ants' carrying capacity: some species can carry leaf pieces up to 50 times their own body weight. They also use chemical communication, releasing pheromones to mark trails and recruit nestmates. This organized collective behavior is a notable example of division of labor and swarm intelligence in the insect world.

Frequently Asked Questions

Why do leafcutter ants carry leaves?

They carry leaves to feed a fungus they cultivate inside the nest. The fungus produces structures that serve as food for the entire colony.

Where do leafcutter ants live?

They are found mainly in the Americas, from the southern United States to Argentina, with the highest diversity in tropical regions.

How long does a leafcutter ant queen live?

The queen can live for more than 20 years, being the sole reproducer in the colony. During this time, she lays thousands of eggs.