Neivamyrmex bohlsi

An underground trail of a South American army ant. The colony has workers of many different sizes, allowing the ants to attack and transport a larger range of prey. Lagunas Yala, Jujuy, Argentina

Neivamyrmex californicus

Army ants on the march. This species, Neivamyrmex californicus, is endemic to California and Baja California. Jasper Ridge, California, USA

Neivamyrmex californicus

Neivamyrmex army ants are specialist predators of the brood of other ant species. Here, N. californicus raid the brood nest of the pavement ant Tetramorium immigrans. California, USA

Neivamyrmex californicus

Neivamyrmex californicus army ants are specialist predators of the brood of other ant species. Here worker army ants attack a defending Tetramorium worker as others plunder the Tetramorium brood. California, USA

Neivamyrmex harrisi

Neivamyrmex harrisi. Close-up of a male army ant. Pima County, Arizona, USA

Neivamyrmex harrisi

Neivamyrmex harrisi. Male army ants are sometimes called "sausage flies" for their distinctive appearance. Pima County, Arizona, USA

Neivamyrmex harrisi

Neivamyrmex harrisi is one of the most commonly seen army ant males that fly to lights at night in Arizona. Although the workers of this species are known, they are not often seen as they are largely subterranean. Many army ant species are only known from either males or from workers, leading to a confusing double taxonomy where the same biological species has a male and a female name. Pima County, Arizona, USA

Neivamyrmex harrisi

Neivamyrmex harrisi. Male army ants are highly specialized creatures. Their large eyes help them navigate as they try to locate colonies where they may find potential mates, and their elongate mandibles are used to grasp queens during mating. Pima County, Arizona, USA

Neivamyrmex harrisi

Male army ants are sometimes called "sausage flies" for their distinctive appearance. Pima County, Arizona, USA

Neivamyrmex impudens

Neivamyrmex impudens is a slender, nocturnal army ant found in Central America. This colony was photographed raiding a nest of Nylanderia. Armenia, Belize

Neivamyrmex impudens

Neivamyrmex impudens is a large, slender nocturnal army ant found in Central America. This colony was photographed raiding a nest of Nylanderia. Armenia, Belize

Neivamyrmex melanocephalus Sycamore Canyon, Arizona, USA

Neivamyrmex melanocephalus army ants initiating a live-ant bridge with their own bodies. Here two ants lean against each other while a third starts to climb. Sycamore Canyon, Arizona, USA

Neivamyrmex nigrescens

An army ant worker photographed during a night raid in California's coast range. Hastings Reserve, Carmel Valley, California.

Neivamyrmex nigrescens

Most army ant species are predators of other ants. TheseNeivamyrmex workers subdue a male Pheidole big-headed ant that was flushed from his colony during an evening raid. Hastings Reserve, Carmel Valley, California.

Neivamyrmex nigrescens

Most army ant species are predators of other ants. TheseNeivamyrmex workers subdue a male Pheidole big-headed ant that was flushed from his colony during an evening raid. Hastings Reserve, Carmel Valley, California.

Neivamyrmex nigrescens

Most army ant species are predators of other ants. This Neivamyrmex worker is carrying a male Pheidole big-headed ant back along a feeder trail behind the raiding front. Hastings Reserve, Carmel Valley, California.

Neivamyrmex nigrescens Huachuca Mountains, Arizona, USA

A raiding column of Neivamyrmex nigrescens. Huachuca Mountains, Arizona, USA

Neivamyrmex nigrescens army ants are predators of other ant species. Here an army ant worker carries a paralyzed prey ant back from a successful raid on an Aphaenogaster nest. Huachuca Mountains, Arizona, USA

Neivamyrmex army ants prey primarily on the brood of other ant species, but they will also take adult ants. Here army ants make short work of a Lasius foundress queen they encountered in a subterranean raid. (Neivamyrmex nigrescens). Portal, Arizona, USA

A male army ant during a nighttime nest emigration of Neivamyrmex nigrescens. Portal, Arizona, USA

Neivamyrmex nigrescens is a predator of other ant species. The different sizes of workers in a colony are specialized for carrying different prey sizes. Huachuca Mountains, Arizona, USA

Neivamyrmex opacithorax Chiricahua Mountain, Arizona, USA