3 Bugs That Look Like Argentine Ants

1. Odorous House Ant

A small, dark brown to black ant that trails along counters and sinks looking for sweets. Crushed workers give off a smell often compared to rotten coconut.

How it differs:

• Color: Argentine Ants are brown; odorous house ants are black and brown.
• Where found: look for Argentine ants in the kitchen and in gardens and on plants; odorous house ants turn up in the kitchen and in the bathroom.
• Signature feature: Argentine Ants: uniform light-brown body with one flat node. Odorous House Ants: small, uniformly dark ant with an uneven thorax.

2. Red Imported Fire Ant

A small, aggressive reddish-brown ant that builds dome-shaped mounds of loose soil in sunny lawns and fields across the southern US. When disturbed, workers swarm and sting repeatedly.

How it differs:

• Size: Red Imported Fire Ants are larger, reaching 6 mm, while Argentine ants top out around 3 mm.
• Color: Argentine Ants are brown; red imported fire ants are red and brown.
• Risk: the Argentine ant is a nuisance pest but not a health threat to most people, while the red imported fire ant can cause medically significant bites, stings or disease.

3. Longhorn Crazy Ant

A dark, slender ant with extremely long legs and antennae that runs in fast, jerky, seemingly random paths. It nests in soil, trash and wall voids, mostly in warm southern states.

How it differs:

• Color: Argentine Ants are brown; longhorn crazy ants are black and gray.
• Where found: look for Argentine ants in the kitchen and in gardens and on plants; longhorn crazy ants turn up in the kitchen and in lawns and grass.
• Signature feature: Argentine Ants: uniform light-brown body with one flat node. Longhorn Crazy Ants: long legs and antennae relative to its body.

Side-by-side comparison

Quick identification checklist

1. Count the legs. Argentine Ants have 6 legs.
2. Check for wings. Argentine Ants are usually seen without wings.
3. Measure it. Argentine Ants are 2–3 mm (up to about 0.12 in).
4. Look for the signature feature: uniform light-brown body with one flat node.
5. Note where you found it. Argentine Ants are usually in the kitchen and in gardens and on plants.

When you'll see Argentine ants

Argentine Ants are most active in spring, summer and fall. In spring, overwintering adults become active and many species lay their first eggs. Summer heat speeds up development, so populations can grow quickly. In fall, many bugs look for shelter, and some move toward or into buildings.

Typical places to check: kitchen and garden or plants.

About ants

The Argentine ant is one of the ants. Ants live in colonies ruled by one or more egg-laying queens. The workers you see are sterile females foraging for the rest of the colony, so killing visible ants rarely solves anything. Winged ants, called swarmers, appear when a mature colony sends out new kings and queens.

Bait works because workers carry it back and share it with the queen and larvae. Repellent sprays can scatter the colony and make the problem harder to fix.

Are Argentine ants or their lookalikes dangerous?

• Argentine Ant: Argentine ants don't sting and rarely bite; they protect aphids and scale insects on garden plants.
• Odorous House Ant: Odorous house ants are a nuisance only; they rarely bite and don't sting.
• Red Imported Fire Ant: Fire ant stings burn, form white pustules, and can cause severe allergic reactions in sensitive people.
• Longhorn Crazy Ant: Crazy ants rarely bite and don't sting; their sheer numbers make them a nuisance.

Frequently asked questions