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Among the most damaging pest ant species is Solenopsis invicta, a fire ant native to South America. This species has been accidentally imported to the southern United States, eastern Australia, China, and elsewhere. Here a worker fire ant is shown in stereotypical defensive posture, her sting extruded, waving a droplet of venom in the air. Austin, Texas, USA
A feisty little Argentine ant (Linepithema humile) attacks a much larger fire ant (Solenopsis invicta). Both species co-exist naturally in subtropical South America, but in the southern United States where both have been accidentally introduced, the fire ant has displaced the Argentine ants. Austin, Texas, USA
Podomyrma gratiosa fighting with Crematogaster. Naracoorte, South Australia
Myrmecia pilosula jack-jumper ants from neighboring nests, engaged in battle. Tower Hill, Victoria, Australia
A large Podomyrma gratiosa tree ant attacks a column of smaller Crematogaster workers that pass too close to her nest. The Crematogaster fight back, and even though the large size and heavy armor of the Podomyrma allow it a one-on-one advantage, the superior numbers of Crematogaster give the smaller ants the edge in this fight. Naracoorte, South Australia
Odontomachus chelifer. Ants from different colonies don't normally tolerate each other. Here, a trap-jaw ant dispatches an intruder from a neighboring nest. Aragua, Venezuela
Nomamyrmex army ants are among the few animals that successfully attack leafcutter ant nests. The leafcutters are not without their defenses. Here two Atta workers attack and kill a Nomamyrmex esenbeckii scout, preventing the army ants from discovering the leafcutter's trail. Gamboa, Panama
An unfortunate Opsithopsis respiciens strobe ant has been discovered in the treetop territory of Oecophylla smaragdina weaver ants and is summarily executed. Cape Tribulation, Queensland, Australia
An unfortunate Opsithopsis respiciens strobe ant has been discovered in the treetop territory of Oecophylla smaragdina weaver ants and is summarily executed. Cape Tribulation, Queensland, Australia
Odontomachus chelifer. Ants from different colonies don't normally tolerate each other. Here, a trap-jaw ant dispatches an intruder from a neighboring nest.

Aragua, Venezuela
Odontomachus chelifer. Ants from different colonies don't normally tolerate each other. Here, a trap-jaw ant dispatches an intruder from a neighboring nest. Aragua, Venezuela
Odontomachus chelifer. Ants from different colonies don't normally tolerate each other. Here, a trap-jaw ant dispatches an intruder from a neighboring nest.

Aragua, Venezuela
See photo in original gallery.
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all images and text © Alex Wild 2001-2013