Red ants vs. black ants - what's the difference?

When people talk about red ants, they're usually referring to the red imported fire ant (Solenopsis invicta). It’s one of the most aggressive ant species found in the U.S., known for its painful sting and large, dome-shaped mounds.

• Appearance — 2mm to 6mm long; reddish-brown to dark red; two-segmented waist; stinger present
• Habitat — Dome-shaped mounds in open, sunny areas, like lawns, fields, roadsides, and schoolyards
• Behavior — Highly aggressive when disturbed; sting repeatedly and in large numbers
• Risks — Stings cause a burning sensation and can trigger serious allergic reactions in some people

The odorous house ant is one of the most common species of black ant found in homes across the U.S. Named for the rotten coconut-like smell they release when crushed, these ants are persistent indoor invaders.

• Appearance — 2mm to 3mm long; dark brown to black; slender body; bent antennae; no stinger
• Habitat — Nest in wall voids, under floors, near moisture sources, and in soil; frequently enter homes in search of food
• Behavior — Forage in trails; strongly attracted to sweet foods and sugary spills; docile
• Risks — Nuisance pest; can contaminate food, but rarely poses a direct health risk