Dorylus driver ants are quick to defend their colonies. Here, a soldier bites down on an intruding myrmecologist. This behavior has been co-opted by traditional medicine in some cultures to make sutures of ant heads.

Kibale forest, Uganda
A driver ant soldier - Dorylus

Kibale Forest, Uganda
An Atta laevigata soldier advances on the photographer. These giant ants are specialized for nest defense, and their bite easily draws blood.

Carrancas, Minas Gerais, Brazil
An Atta laevigata soldier advances on the photographer. These giant ants are specialized for nest defense, and their bite easily draws blood.

Carrancas, Minas Gerais, Brazil
An Atta laevigata soldier advances on the photographer. These giant ants are specialized for nest defense, and their bite easily draws blood.

Carrancas, Minas Gerais, Brazil
Camponotus sericeiventris is one of the largest carpenter ants in the world.

Carrancas, Minas Gerais, Brazil
When threatened, a worker Camponotus sericeiventris tucks her gaster under her body, aiming the acid-ejecting acidopore forward at the perceived threat.

Carrancas, Minas Gerais, Brazil
Iridomyrmex purpureus meat ants are aggressive in defense of their colonies. Here, a guard ant attempts to take down the photographer.

Yandoit, Victoria, Australia
Iridomyrmex purpureus meat ants are aggressive in defense of their colonies. Here, a guard ant attempts to take down the photographer.

Yandoit, Victoria, Australia
When threatened, a worker Camponotus sericeiventris tucks her gaster under her body, aiming the acid-ejecting acidopore forward at the perceived threat.

Carrancas, Minas Gerais, Brazil
When threatened, a worker Camponotus sericeiventris tucks her gaster under her body, aiming the acid-ejecting acidopore forward at the perceived threat.

Carrancas, Minas Gerais, Brazil
When threatened, a worker Camponotus sericeiventris tucks her gaster under her body, aiming the acid-ejecting acidopore forward at the perceived threat.

Carrancas, Minas Gerais, Brazil
See photo in original gallery.
all images and text © Alex Wild 2001-2013