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Thief Ants: Tiny Grease Ants & How to Get Rid of Them
Thief ants are among the smallest house ants and prefer grease, not sweets. Here is how to identify them, tell them from pharaoh ants, and get rid of them.
Thief ants are among the smallest ants you will ever find in a kitchen — about 1/16 inch — pale yellow to light brown, and named for their habit of nesting right next to other ant colonies and stealing their food and young. They are often mistaken for pharaoh ants, and unlike most household ants they prefer grease and protein over sweets.
Minute pale thief ants gathered at a greasy food spot — grease, not sweets, is the draw.
How to identify thief ants
Thief ants are tiny and pale, with two nodes at the waist, very small eyes, and a two-segmented club at the tip of the antennae. That antennal club is the key difference from the similar-looking pharaoh ant, which has a three-segmented club. Their extremely small size lets them slip through cracks most ants cannot.
Why they’re called thief (grease) ants
The name comes from their behavior: thief ants nest close to the colonies of larger ants and steal their food and brood, staying small enough to go unnoticed. In the kitchen, that same appetite shows up as a strong preference for grease, oils, and protein — which is why they are also called grease ants, and why sweet baits often fail on them.
Where you’ll see them
Indoors they trail along counters, in pantries, and near other ant activity; outdoors they nest in soil, under rocks, and in wall voids. Because they are so small, they slip in through tiny gaps around windows, outlets, and baseboards, and their trails can be easy to miss.
How to get rid of thief ants
1. Use grease and protein bait. This is the big one — thief ants ignore many sweet baits. A grease- or protein-based bait is what they will actually carry home.
2. Don’t spray the trail. Spraying scatters them; let the bait reach the nest.
3. Clean and seal. Wipe up grease and crumbs, store food sealed, and caulk the tiny gaps they use to get in.
For the general approach, see our guide to getting rid of ants.
When to call a pro
Their tiny size and hidden nests make thief ants frustrating to chase on your own. If they keep reappearing, our ant control service uses the right grease-based baits and seals the entry points they exploit.
See our ant control process →Thief ant FAQ
How do you get rid of thief ants?
Bait with a grease- or protein-based product (not just sweet bait), avoid spraying, and seal the tiny gaps they enter through. Their small size and hidden nests often mean professional help is the fastest route.
Are thief ants harmful?
They do not sting or damage structures, but they contaminate food — and because they scavenge protein, including dead insects, they can carry contaminants into the kitchen.
Why are thief ants in my house?
They are foraging for grease and protein and can squeeze through the smallest gaps. Kitchens and pantries with any greasy residue are prime targets.
What attracts thief ants?
Grease, oils, meats, and other protein — more than sweets. That preference is why sweet ant baits frequently fail against them.
Tiny ants ignoring your ant bait? They may be thief ants.
Call (559) 472-8200 or request a no-cost inspection — we use the grease-based baits thief ants actually take.