Ants

Ants at a glance

Need to know

• Ants form complex societies with division of labor and can build intricate underground colonies.
• There are more than 13,500 described ant species, with estimates as high as 16,000 globally.
• Leafcutter ants farm fungus, which they grow on gathered leaf fragments.
• Some ant queens can live for up to 30 years, an exceptionally long lifespan for insects.
• Ants are found on every continent except Antarctica.
• Together, all ants are estimated to weigh about as much as all the wild birds and mammals combined.

About the Ants

Ants are social insects of the family Formicidae and are among the most successful and ecologically significant organisms on Earth. With over 13,500 known species spread across nearly every landmass, ants exhibit a vast array of sizes, behaviors, and ecological roles. Most ant species live in highly organized colonies or nests that can range from a few dozen individuals living in small cavities to millions forming sprawling complex societies.

Ants display remarkable adaptation and division of labor, with distinct castes such as workers, soldiers, and queens. These insects are key ecosystem engineers, influencing soil turnover, plant distribution, and interactions with numerous animal and plant species. While some species are considered household nuisances or agricultural pests, many others are vital to local ecology through their roles in decomposition, seed dispersal, and predation on pests.

Physical characteristics

Size: 0.1–3 cm in length, most between 0.3–1.5 cm. Weight: 0.001–0.15 g. Lifespan: Workers average 1–3 years; queens can live up to 30 years.

• Narrow, constricted waist called a petiole
• Elbowed (geniculate) antennae
• Mandibles adapted for biting, cutting, or carrying items
• Distinct separation between head, thorax, and gaster (abdomen)
• Varied coloration commonly black, brown, red, or yellow

Notable species

• Argentine Ant (Linepithema humile) — Not Evaluated. Moist habitats, urban environments, forests, grasslands Regions: South America, Mediterranean Europe, Southeast United States, California, Australia, South Africa.
• Red Imported Fire Ant (Solenopsis invicta) — Not Evaluated. Open sunny areas, disturbed land, lawns, agricultural fields Regions: South America (native), Southeast United States, China, Australia, Taiwan, Caribbean Islands.
• Leafcutter Ant (Atta cephalotes) — Not Evaluated. Tropical rainforests, savannas Regions: Central America, South America - Amazon Basin, Panama, Guiana Shield, Eastern Andes foothills.
• Bulldog Ant (Myrmecia pyriformis) — Least Concern. Woodlands, open forests, coastal heaths Regions: Eastern Australia, Tasmania.
• Black Garden Ant (Lasius niger) — Not Evaluated. Gardens, urban areas, grasslands, forest edges Regions: Europe, Asia, North Africa, Introduced to North America.
• Driver Ant (Dorylus molestus) — Not Evaluated. Tropical forests, savannahs Regions: Central Africa, West Africa, East Africa, Tropical forests and savannas.

Habitat and range

Original range: Ants are believed to have originated in tropical South America during the Cretaceous period.

Current distribution: Currently distributed throughout every continent except Antarctica, occupying nearly all terrestrial habitats.

Preferred environments: Tropical rainforests, Savannas, Deciduous and coniferous forests, Deserts, Grasslands, Alpine regions, Urban areas

Regions: North America, South America, Central America, Europe, Africa, Asia, Southeast Asia, Australia, Madagascar

Where to see Ants

• Amazon Rainforest — Year-round. Many leafcutter, army, and bullet ant species are visible; watch the forest floor and decaying logs.
• Urban parks in Europe (e.g., Hyde Park, London) — Spring to late summer. Black garden ants are common around lawns and pathways.
• Australian bushland around Sydney — Spring and summer. Look for large, aggressive bulldog ants nesting in ground burrows.
• Coastal Southeastern United States — Late spring through fall. Red imported fire ants nest in disturbed soils, lawns, and fields.

Behavior and diet

Diet: Ant diets are highly variable and species-dependent; most are omnivorous, feeding on plant matter, seeds, nectar, fungi, insects, and even small vertebrates.

Social structure: Ants live in structured colonies with castes including queens, males, workers, and sometimes soldiers, each performing specialized roles.

Communication: Ants communicate via pheromones (chemical signals), touch, and, in some species, by sound (stridulation); pheromone trails guide others to food or sound alarms.

• Leafcutter ants cultivate fungus as their exclusive food source.
• Army ants perform large-scale coordinated swarming raids.
• Many ant queens start new colonies alone (claustral founding), living off their body reserves until the first workers appear.
• Some ants 'herd' or milk aphids for sugary honeydew in mutualistic relationships.

Interactions with other animals

• Aphids (Symbiotic): Ants protect aphids from predators in exchange for honeydew secretions.
• Termites (Competitive): Ants and termites may compete for territory and food; some ants prey upon termite colonies.
• Spiders (Prey and predator): Ants can become prey for specialized spider species, but some ants will attack and kill spiders.

Conservation

IUCN Red List status: Least Concern

Threats

• Habitat loss due to deforestation and urbanization (localized effects)
• Invasive ant species outcompeting native ants
• Pesticide use impacting colony health
• Climate change altering habitats

Conservation efforts

• Management and control of invasive ant species
• Conservation of native ant habitats
• Long-term ecological monitoring of ant diversity
• Education programs about the importance of ants in ecosystems

How to help

• Avoid introducing invasive ant species via transported goods or soil.
• Support conservation of forests and natural habitats.
• Minimize pesticide use in gardens and urban environments.
• Participate in citizen science projects like ant biodiversity monitoring.

Ants facts for kids

Ants are tiny insects that work together in big families called colonies. They can carry things much heavier than their bodies and build amazing nests underground or in trees. You can find ants almost everywhere you go!

• Some ants can swim, but most prefer to stay on land.
• Ants talk to each other using special smells called pheromones.
• Some queen ants live longer than any other insects—up to 30 years!
• Fire ants can sting you, and it feels very hot—like a burn.
• Ants can lift pieces of food many times heavier than themselves!

Did you know? Did you know? All the ants in the world together weigh about the same as all people on Earth!

Watch & learn

• Super Ants: Nature’s Secret Power — PBS Nature. This documentary explores the intricate social structures of ants, showcasing their impressive teamwork, defiance of natural obstacles, and unique adaptations. It's highly educational and visually captivating, especially for those seeking to understand Formicidae's ecological impact.
• World’s Deadliest Ants: Army Ant Swarms — National Geographic Wild. National Geographic Wild investigates the lethal strategies and overwhelming swarms of army ants, capturing dramatic hunting footage and rarely seen behaviors in their natural environments.
• BBC Earth's Deadly Ant Armies — BBC Earth. BBC Earth reveals the military precision of ant colonies as they wage war, forage, and defend their queen, using high-definition macro cinematography to expose life inside the swarm.
• Smithsonian Channel: Ants—Tiny Architects of the Animal World — Smithsonian Channel. Focusing on the engineering marvels built by various ant species, this program uncovers how Formicidae construct intricate underground cities and maintain complex division of labor.
• Ants: The Invisible Majority — PBS Nature. This episode delves into ants’ extraordinary global success, examining their communication, superorganism behavior, and diverse roles in different ecosystems.