Christian Ziegler / Army Ant (Eciton hamatum) colony forming a bridge by climbing over each other, some are carrying food back to nest, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) nest constructed completely of ants hanging onto each other, Barro Colorado Island, Panama

James Christensen / Army Ant (Eciton hamatum) soldier guarding workers, Colon, Panama

Christian Ziegler / Army Ant (Eciton hamatum) migration of a colony, this species relocates every night and workers transport the larvae and food, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) bridge made by ants during a raid, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton burchellii) soldier is cornered by workers of rival Army Ant (Eciton hamatum) species

Mark Moffett / Army Ant (Eciton hamatum) workers linking to one another toe to toe, building a new bivouc for the day, hundreds of thousands of ants will eventaully join in, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton hamatum) major worker. Also called a soldier, its primary job is defending the colony, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton hamatum) major worker biting human. Also called a soldier, its primary job is defending the colony, Barro Colorado Island

Mark Moffett / Army Ant (Eciton hamatum) major worker. Also called a soldier, its primary job is defending the colony, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton i) soldier fighting two smaller workers of rival army ant (Eciton hamatum) species. The two colonies sparred for an hour in a chance meeting and retreated without fatalities, Barro Co...

Mark Moffett / Two army ant species fighting, larger (Eciton i) and the smaller (Eciton hamatum). The two colonies sparred for an hour in a chance meeting and retreated without fatalities, Barro Colorado Island, Pan...

Mark Moffett / Army Ant (Eciton burchellii), large soldier is cornered by workers of rival army ant (Eciton hamatum) species. The two colonies sparred for an hour in a chance meeting and retreated without fatalities...

Mark Moffett / Army Ant (Eciton hamatum) major worker or soldier, whose main job is defending the colony, biting human finger with sharp and powerful mandibles, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton hamatum) workers of different sizes link toe to toe forming a massive nest or bivouac, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton burchellii) soldier is cornered by smaller worker of rival Army Ant (Eciton hamatum) species, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton hamatum) worker fighting with another Army Ant (Eciton burchellii) species, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) colony forms a bridge by clinging together, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) swarm attacking and killing scorpion, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) colony forms a bridge by clinging together, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) workers with huge mandibles guarding nest entrance, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) swarm, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) colony forming a bridge by climbing over each other, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) guarding their own brood during an emigration between two nest sites, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) temporary nest called a bivouac, workers bringing in wasp larvae as food, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) raiding a paper wasp nest and pulling the larvae out of their cells, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) teamwork in food transportation, a large wasp pupae is carried by several workers, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) raid, swarming the forest floor up to 50 feet wide, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) food cache of army ants, where food is stored during a raid to be more efficient in transporting food back to nest, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) portrait of a soldier with large mandibles, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) attack caterpillar during a raid, Barro Colorado Island, Panama

Christian Ziegler / Army Ant (Eciton hamatum) food cache where food is stored during a raid to be more efficient in transporting food back to nest, Barro Colorado Island, Panama

Piotr Naskrecki / Army Ant (Eciton hamatum) motionless soldier guards an endless stream of workers leaving the bivouac, Costa Rica

Piotr Naskrecki / Rove Beetle (Staphylinidae) is tolerated by Army Ants (Eciton hamatum) by mimicking their chemical signals, Costa Rica

Piotr Naskrecki / Army Ant (Eciton hamatum) soldiers, like all workers in the colony, are non-reproductive females, Costa Rica

Piotr Naskrecki / Army Ant (Eciton hamatum) soldier displays its giant mandibles, soldiers will attack any enemy regardless size, Costa Rica

Piotr Naskrecki / Army Ant (Eciton hamatum) colony composed of thousands of living ants, Costa Rica

Mark Moffett / Army Ant (Eciton hamatum) major worker biting finger mandibles while stinging which turns the finger red. Also called a soldier, its primary job is defending the colony, Barro Colorado Island, Panama

Mark Moffett / Army Ant (Eciton hamatum) major worker biting finger mandibles while stinging which turns the finger red. Also called a soldier, its primary job is defending the colony, Barro Colorado Island, Panama