Which Ant Do You Have?
By the Clark Pest Entomology Team
Last updated: October 28, 2026
Quick answer: Check three things: size, color and where the ants are. Tiny black ants in the kitchen are often odorous house or pavement ants. Big black ants near wood may be carpenter ants. Red ants that nest in soil and sting hard are fire ants. Match what you found below.
Pick the Closest Ant Match
Start with where you saw them and how big they are. Tap the closest match.
California Fire AntA native stinging ant. It builds irregular crater nests in soil, woodwork and even electrical boxes. The sting hurts.
Red Imported Fire AntRed to brown head and body with a black rear end. It nests in open, sunny ground near watered lawns, parks and golf courses.
Southern Fire AntYellowish red with a black abdomen. It nests in the ground but can set up near a kitchen, in wood, soil or masonry.
Carpenter AntOne of the biggest house ants, reddish brown to black. It tunnels through wood to build its nest.
Argentine AntTiny, light to dark brown and stingerless. It marches in long trails and loves sweets.
Odorous House AntTiny and black. Crush one and it smells like rotting coconut. Colonies can hold many queens.
Pavement AntLight brown to black with pale legs. It nests in pavement cracks and goes for greasy food.
Pharaoh AntYellow to reddish and almost see-through. It stays indoors and is one of the hardest ants to control.
Thief AntTiny and pale yellow to brown. Often mistaken for a pharaoh ant until you look at the antennae under a magnifier.
Little Black AntTiny, dark brown to black and darker than a pharaoh or thief ant. Its sting is weak.
Harvester AntOrange, red or reddish black. It builds mounds in the yard instead of inside the house, and it stings.
Velvety Tree AntA velvety black rear end, a yellowish red middle and a brownish black head. It nests in trees, stumps and under stones.
Ant Identification Chart: Size, Color and Where You Find Them
Most pest ants are small, so color and nest spot do most of the work. Ant size runs from about 1/16 inch to about 1/2 inch.
| Ant | Size | Color | Where you find it |
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| California fire ant | 1/16 to 1/4 inch | Reddish with a black abdomen | Crater nests in soil, woodwork and electrical boxes |
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| Red imported fire ant | 1/8 to 1/4 inch | Red to brown head and body, black abdomen | Open, sunny ground near watered lawns and parks |
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| Southern fire ant | 1/16 to 1/4 inch | Yellowish red head and middle, black abdomen | Soil, wood and masonry, sometimes near the kitchen |
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| Carpenter ant | 1/8 to 1/2 inch | Reddish brown to black | Tunnels in wood |
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| Argentine ant | About 1/16 inch | Light to dark brown | Trails along walls, plants and sweet food |
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| Odorous house ant | 1/16 to 1/8 inch | Black | Kitchens and yards. Smells like rotting coconut when crushed |
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| Pavement ant | 1/16 to 1/8 inch | Light brown to black, pale legs | Pavement cracks and greasy food |
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| Pharaoh ant | About 1/16 inch | Yellow to reddish, almost see-through | Mostly inside buildings, near warm, moist spots |
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| Thief ant | About 1/16 inch | Pale yellow to brown | Soil, decaying wood, wall voids and behind baseboards |
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| Little black ant | About 1/16 inch | Dark brown to black | Homes and yards |
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| Harvester ant | 1/4 to 3/8 inch | Orange, red or reddish black | Mounds in the yard, often covered in pebbles |
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| Velvety tree ant | Workers vary in size | Black rear end, yellowish red middle | Trees, stumps and under stones |
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Ants or Termites? Check the Waist
Winged insects on a windowsill cause the most panic. UC IPM gives a quick check. Ants have a narrow waist, elbowed antennae and back wings shorter than the front ones. Termites have a broad waist, straight antennae and wings of equal length.
If yours looks like a termite, jump to our termite guide.
What Your Ants Are Telling You
A trail to the sugar bowl, pet food or the sink
Tiny ants marching in a line usually mean odorous house, pavement or Argentine ants. Pavement ants like greasy food. Argentine ants go for sweets year-round. Follow the trail back to see where it starts.
Big ants near wood or windowsills
Large black or reddish ants near wood point to carpenter ants. They tunnel through wood to nest. Look for piles of fine, sawdust-like debris, which pros call frass, and check any spot where wood stays damp.
Mounds or crater nests in the yard
A mound or crater with ants that sting is a fire ant or harvester ant. Don't poke it. Fire ants can sting in large numbers. UC IPM warns people not to collect ants they think are red imported fire ants.
Tiny pale ants in bathrooms, bedrooms or wall voids
That fits pharaoh ants or thief ants. Both are small and yellowish. In California, pharaoh ants mostly nest indoors, often in wall voids and near hot water pipes, which makes them a hard indoor problem.
Ants all over a plant
Ants on plants are often after honeydew, the sticky waste of aphids, mealybugs and scales. The ants guard those insects. Treating the honeydew makers matters as much as treating the ants.
What to Do About Ants
Don't spray the trail first. Sprays kill the ants you can see. The colony sends more. Baits work differently. Workers carry the bait home and share it with the queens. UC IPM says bait control can take more than a week, so be patient.
Match the bait to the ant. Some ants want sugar and some want protein. If they ignore the bait, it does nothing. Late winter and spring are the best times to start because colonies are smaller.
Keep mulch, leaves and plants a few inches back from the walls. Trim branches that touch the house. Seal gaps where ants walk in. To get an ID, scoop a few ants onto paper, seal them in a container and freeze them for a few minutes. The UC IPM ant guide walks through the whole process.
Clark's Expert Insight
Baits beat sprays, but only if the ant likes the bait. A fast ID matters more than a fast spray. If the ants ignore what you put out, the bait did nothing. A technician who knows the species can pick the right one the first time.
Ant Questions Homeowners Ask
Are there fire ants in California?
Yes. The California fire ant is a native stinging ant found across the state. The red imported fire ant is a separate invasive ant. Their pages explain how to tell them apart.
What are the tiny black ants in my house?
Most often odorous house ants, pavement ants or little black ants. Odorous house ants smell like rotting coconut when crushed. Pavement ants nest in cracks near pavement and like greasy food. Little black ants have a weak sting.
How can I tell ants from termites?
Look at the waist, antennae and wings. Ants have a narrow waist, elbowed antennae and back wings shorter than the front ones. Termites have a broad waist, straight antennae and wings of equal length.
Why do ants keep coming back after I spray?
Sprays kill the foragers you see, but the nest keeps sending more. Baits that workers carry back to the colony work better. They can take more than a week to show results.
What do odorous house ants smell like?
Crush one and you will notice a strong smell. People often compare it to rotting coconut.
Do carpenter ants eat wood?
No. Carpenter ants tunnel through wood to build their nests, but they don't eat it the way termites do. They still weaken the wood over time, so call a technician if you see sawdust-like debris.