Velvet Ants ("Cow Killers"): Fuzzy Wasps That Sting Hard
That fuzzy, bright red-and-black "ant" racing across a sunny patch of yard is a velvet ant, and it isn't an ant at all. It's a wingless female wasp with a long stinger and a sting AgriLife describes as far worse than a bee's. They travel alone, build no nest on your house, and the practical answer is shoes and a little distance rather than sprays.
To have someone look at what's crawling around your property, call or text (210) 281-1064 or request a visit online.
Not an ant: what a velvet ant really is #
Velvet ants are wasps in the family Mutillidae. AgriLife's venomous animals bulletin calls them wingless wasps that look like fuzzy ants, and a 2025 TPWD magazine article makes the same point: the wingless females resemble ants, but they're wasps.
AgriLife's venomous animals bulletin profiles the red velvet ant (Dasymutilla occidentalis), nicknamed the cow killer.
- Size: about 3/4 inch for the red velvet ant, according to AgriLife. Velvet ants as a group run from about half an inch to an inch, per Insects in the City.
- Color: black with orange-red markings on the red velvet ant. Other species come in black, brown, red, orange, yellow or even white patterns, and AgriLife notes most of the similar species are much smaller.
- Texture: a dense, velvety coat of hair on the female.
- Body: very hard. AgriLife says they're tough to crush.
- Sound: both sexes can squeak when cornered.
Velvet ant or a real ant? #
Size and company give it away. A red imported fire ant worker is tiny, about 1/16 to 3/16 inch according to AgriLife, smooth and reddish brown, and it never shows up alone: thousands of them live together in a mound of loose soil. A velvet ant is several times bigger, covered in hair, and almost always by itself, hurrying across open ground.
Disturb a fire ant mound and the workers rush out and run up anything upright, including your leg. If the "ant" you found is solitary, fuzzy, brightly colored and close to an inch long, treat it as a stinging wasp and keep your hands away. Our fire ant guide covers the mound-building kind.
Why do some have wings? #
The sexes look so different that people assume they're two insects. Females are wingless, ant-shaped and furry. Males have wings and look much more like ordinary wasps.
The Insects in the City fact sheet on velvet ants explains the split in behavior: females crawl, while AgriLife says males fly low over grass looking for them. Only the wingless females carry a stinger.
How do they live? #
Velvet ants are parasites of other insects. A female runs quickly over the ground, searching for the nests of ground-nesting bees and wasps. When she finds one, she gets inside and lays eggs so her young can feed on the host's brood.
That's why you see them on:
- bare or sandy ground, where females do their searching
- grassy areas, where males cruise low looking for females
- spots where ground-nesting bees or wasps are active
They don't build nests of their own on structures, and they move around alone. A velvet ant you see today has probably moved on by tomorrow.
When are they out? #
Insects in the City describes velvet ants as summertime insects found in both towns and countryside across Texas. There's usually a single generation each year. The young spend winter inside the host's nest in a pre-pupal stage, so the next round of adults appears the following summer. Sources don't narrow the season to specific months.
The sting and the "cow killer" name #
AgriLife's venomous animals bulletin says the stings are considered extremely painful and the stinger (technically an ovipositor) is very long. Insects in the City says the sting is usually much more painful than a bee sting.
As for the nickname, AgriLife says the red velvet ant earned "cow killer" because of how much the sting hurts. TPWD is clear that they can't really kill cows.
Who gets stung? Mostly people walking barefoot where velvet ants are active, and people who pick them up. Insects in the City notes a person is unlikely to get stung more than once.
Males are no threat. AgriLife says males cannot sting.
First aid for a velvet ant sting #
Insects in the City recommends treating it the way you'd treat a bee sting:
- Clean and disinfect the site.
- Apply an ice pack to ease pain and swelling.
- Take an over-the-counter pain reliever if needed, following the package directions.
Get medical care right away if the person develops a rash spreading over the body or has any trouble breathing.
Prevention: what actually helps #
Insects in the City is frank that effective control measures for velvet ants are limited. Its main recommendations are education and footwear, not spraying.
Do:
- Wear shoes outdoors in summer, especially in sandy or bare areas.
- Teach kids what a velvet ant looks like and that it should never be picked up.
- Let a lone wanderer pass. It's hunting for bee and wasp nests, not for people.
Don't:
- Try to squash one with bare hands or bare feet. The body is hard to crush, and handling is one of the main ways people get stung.
- Expect a yard spray to solve the problem. Velvet ants roam, and the sources we use don't recommend spraying.
When does a visit make sense? #
Most homes never need professional help for velvet ants. A visit can be worth it if:
- you're seeing many of them around a play area or pool deck
- ground-nesting bees or wasps, the velvet ants' hosts, are very active near the house
- you'd like a positive ID, especially if a child or guest has been stung
Ground-nesting wasps are something Pest Trappers handles, and sorting those out may leave velvet ants with less reason to visit. Related guides: cicada killers and tarantula hawks, two other solitary wasps people meet in the yard.
How Pest Trappers handles velvet ants #
The technician inspects the yard to confirm what you're seeing and looks for host activity: ground-nesting bees and wasps in bare or sandy soil. You'll get a plain explanation of what can and can't be done. For velvet ants themselves, the honest answer is usually footwear and awareness; for any host nests that need treatment, the options are explained and products are applied only as their labels direct.
Pest Trappers LLC (TPCL #0887549) is family-owned and licensed by the Texas Department of Agriculture. We give pricing after the inspection; call for a quote.
Local pages: Stone Oak, New Braunfels, Comfort and Fair Oaks Ranch.