Weaver Ant

Weaver ants belong to the genus Oecophylla, comprising two closely related species: Oecophylla smaragdina, found across South and Southeast Asia and northern Australia, and Oecophylla longinoda, found across sub-Saharan Africa. Both species are entirely arboreal, living and nesting within the canopy of trees rather than in soil.

What sets weaver ants apart from nearly all other ants is their remarkable nest-building behavior: workers pull leaf edges together using chains of their own bodies, while other workers carry larvae back and forth along the seam, using the larvae like living shuttles to spin silk that binds the leaves into a sealed nest.

A single weaver ant colony can occupy many separate leaf nests spread across one or more trees, all connected by a network of scent trails and defended cooperatively, making them among the most territorially aggressive ants in their tropical forest and orchard habitats.

• Workers about 5-10 mm long, with larger major workers and smaller minor workers
• Reddish-orange to orange-brown body coloring with long, slender legs
• Nests are unmistakable: clusters of living leaves stitched together high in tree canopies
• No true stinger; defends aggressively with strong mandibles and can spray formic acid
• Distinguished from other tree-nesting ants by its distinctive leaf-nest architecture and coordinated chain-forming behavior

Weaver ants inhabit the canopy of tropical and subtropical forests, mangroves, and cultivated tree crops such as citrus, mango, and cashew orchards across South and Southeast Asia, northern Australia, and sub-Saharan Africa, depending on the species. They rarely descend to the ground, spending virtually their entire life cycle within tree foliage.

Weaver ants are aggressive predators of other insects and also tend honeydew-producing insects such as scale insects and aphids for sugary secretions. Colonies cooperate closely to build and maintain their leaf nests, with workers forming living chains to pull leaf edges together while others carry larvae to spin silk binding the seams shut. Because of their strong predatory behavior toward other insects, weaver ants have long been used in parts of Asia as a natural form of biological pest suppression in fruit orchards.

Development follows complete metamorphosis through egg, larva, pupa, and adult stages, with larvae playing an unusual additional role as silk producers used in nest construction. Colonies are typically headed by a single reproductive queen, with the broader colony spread across multiple satellite leaf nests connected by trails. Winged reproductives are produced seasonally and disperse via nuptial flights to found new colonies.