STINGING INSECT GUIDE

Africanized honey bee

Identification, local timing in San Antonio and the Hill Country, risk profile, and exactly how we treat it.

Scientific name: Apis mellifera scutellata × European A. mellifera hybrid (often called AHB) Common names: Africanized honey bee, African hybrid honey bee, killer bee Family: Apidae Status in the San Antonio / Boerne corridor: These bees have been around since 1992 and are found in nearly all feral colonies in the area.

At a glance #

Identification #

You can’t tell an Africanized honey bee just by looking at it. This is the most crucial point here.

The bees are a bit smaller and have shorter wings, but the difference is mostly statistical—only noticeable when you look at a large group in a lab. Nowadays, we identify them in labs using morphometric analysis (measuring various parts of many specimens) or, more reliably, through DNA analysis. A field technician can’t tell just by looking, and neither can a beekeeper or an entomologist.

Identification is done by behavior, not appearance:

• European-derived colony: Typically sends 10–20 guard bees to check out any disturbances. They defend a perimeter of about 50 feet and might chase a threat for 50–100 feet.
• Africanized colony: Will quickly send out hundreds of guards in just seconds. They defend a much larger area, often several hundred feet, and can pursue a threat for a quarter of a mile or more.

If a feral colony in Central Texas reacts aggressively to a disturbance from over 50 feet away, you’re likely dealing with Africanized bees, no matter their appearance.

How Africanized bees got to Texas — the actual history #

This story is important to set straight because the "killer bee" myth has gathered a lot of nonsense over the years.

1956. Brazilian geneticist Warwick Kerr went to South Africa to get queens of Apis mellifera scutellata, the East African lowland honey bee. He had a practical aim: European honey bees weren't doing well in Brazil's tropical climate, while A. m. scutellata thrived in the heat and humidity. Kerr wanted to crossbreed them to create a honey bee that could handle South America's conditions better.

Late 1956. Sixty-three African queen bees were transported to an apiary near Rio Claro, São Paulo. Only 48 made it through the journey. After some losses, they ended up with 29 colonies, each equipped with queen excluders—wire mesh devices designed to let smaller worker bees pass while keeping the larger queens and drones from escaping and mating with local European bees.

October 1957. A beekeeper visiting Kerr spotted that the queen excluders were holding back worker bees and decided to take them off. Before anyone figured it out, 26 swarms with African queens had made their way into the Brazilian forest.

Kerr thought they might die off in the wild or mix with the larger European population and fade away. That didn’t happen. The escaped colonies not only survived but also thrived, breeding with local European honey bees and spreading further.

This hybrid moved north at about 100–200 miles per year. It reached Central America by 1982 and Mexico by 1985–1986. The first confirmed Africanized colony in the United States was found near Hidalgo, Texas, on October 15, 1990. By 1992, Africanized bees were confirmed in the San Antonio area — just two years after they crossed the Rio Grande. According to Texas A&M AgriLife Extension, this rapid spread was attributed to their adaptability and aggressive nature.

Feral honey bee colonies in Central and South Texas are mostly Africanized hybrids. This line has been moving north but has slowed down in places with colder winters and more rain. Africanized bees struggle with long cold snaps, so they've mostly settled around the southern plains.

Why they behave the way they do #

The scientific term is "defensive," not "aggressive" — and that distinction is important. Africanized honey bees don’t behave more hostile while they’re out foraging. A worker bee on a flower acts just like any other honey bee. The real difference shows up at the nest.

Apis mellifera scutellata originated in sub-Saharan Africa, where it faced a host of nest-raiding predators like honey badgers, honeyguides, baboons, large monkeys, and other birds and mammals that specialize in breaking into bee nests. Colonies that failed to defend themselves effectively didn't survive to pass on their genes. You can see the results of this pressure in their behavior at every level:

• Guard bee count: Studies in Brazil show that Africanized colonies use seven times more defenders than European colonies when faced with the same threat.
• Sting frequency: Africanized bees can sting you 4 to 10 times more in the first 90 seconds of a disturbance compared to their European counterparts. Some tests have shown a staggering ratio of 8.5 to 1.
• Pursuit distance: European bees usually give up chasing at 50–100 feet, but Africanized bees will follow you for over 500 meters, with some attacks recorded at more than a kilometer.
• Swarm frequency: Africanized colonies swarm several times each season, while European colonies typically swarm just once. This rapid reproduction helps them spread quickly.
• Absconding: Africanized colonies are known to pack up and move to a new location if conditions aren't right, which is something European colonies almost never do.

Local context — San Antonio and the Hill Country #

Multiple fatal attacks have happened in Texas since the 1990s. In 2025, a bee removal specialist in South Texas reported 36 confirmed removals of Africanized colonies in one season, covering areas like Mathis, Flour Bluff, Calallen, and Portland. That's a big jump from previous years. I've seen attacks reported in Bexar, Comal, Kendall, Medina, and Kerr counties. According to Penn State Extension, these incidents highlight the increasing presence and threat of Africanized bees in urban areas.

Common trigger events locally:

• Lawn mowing near a shed, fence line, or meter box can disturb a hidden colony that's gone unnoticed.
• Tree trimming into a live oak hollow may expose a feral colony living inside.
• Dogs investigating a ground-level cavity, like an old rodent burrow or hollow tree base, can trigger a response from the insects.
• Loud construction equipment operating within the defensive radius can provoke aggressive behavior from nearby colonies.
• Vibration from vehicles, weed eaters, or compressors near the nest can stir them up and lead to stings.

In the Boerne, Comfort, Fredericksburg, and Kerrville areas, we often find stinging insects in old barns, stone ranch house walls, pole building soffits, and abandoned deer blinds. Over in Stone Oak, Fair Oaks Ranch, and along the 281 corridor, the most common spots are wall voids behind limestone veneer, chimney returns, and water meter boxes. Throughout the entire corridor, ground-level cavities like tree root holes, utility pedestals, compost bins, and debris piles are where I've seen Africanized colonies show up—places that European bees usually wouldn’t bother with.

What to do if attacked #

This isn't just some abstract worry in Central Texas; it’s a real issue that we deal with every day. That’s why having a solid plan is crucial.

Run. Don't just stand there, don't swat, and forget about trying to "stay calm and back away." Africanized bees react to movement and CO2, and once they decide to attack, they're in it for the long haul. Your best move is to put as much distance as possible between you and the nest — they defend a specific area, and if you get past that, the attack usually stops.

Cover your face. If you can, pull a shirt over your head. Bees usually go for the face, eyes, and ears first. Most injuries come from people losing their vision during the attack, leading to falls and disorientation.

Get indoors. Find a car, a house, or any structure. Sure, some bees might follow you inside — but that's okay. A few bees in a closed space are much less of a threat than thousands buzzing around outside.

Do not jump in a pool. This is probably the worst advice out there. Africanized bees can hover right above the water and wait for you to surface. If you encounter them, it’s best to run away from the nest instead of diving into water.

Seek medical attention if you've been stung more than 15–20 times, or even fewer if you know you have an allergy. The venom isn't more toxic with each sting; the real danger comes from the total amount you get. A thousand stings is serious and can happen in a full-on attack from Africanized bees if you're unable to escape.

Risk to humans and pets #

High. This is the most dangerous stinging insect in the San Antonio area. It’s not that one sting is worse, but when they attack in numbers, things can get serious. The Smithsonian estimates that around 1,000 people have died due to Africanized bees since they came to the Americas. Victims often get about ten times more stings than those attacked by European bees. According to CDC, the risk of severe injury or death increases significantly with the number of stings.

Dogs can really get into trouble with stinging insects. They tend to stick their noses right in places they shouldn't, making it hard for them to get away when bees or wasps are around. Plus, their fur can trap bees against their skin, which only makes things worse. I've seen cases where Texas Africanized bees have attacked, leading to serious injuries or even fatalities in dogs and livestock. It's something to be aware of if you have pets.

Treatment approach — what professionals do #

• Full PPE — sealed bee suit, double gloves, and a sealed veil. This isn't the same as a beekeeper's casual veil.
• Evening treatment — bees are tucked away in the nest at dusk and aren't as active.
• Perimeter clearing — we make sure humans, pets, and neighbors are out of the defensive zone before we start.
• Insecticidal dust or foam is applied directly into the cavity entrance, which we seal after treatment.
• Same removal protocol as European honey bees for comb removal and cavity cleanup — an Africanized colony with 40 pounds of honey in a wall will stain drywall just like a European one.
• We do not attempt live relocation of confirmed defensive-behavior colonies. Following guidance from the Texas Apiary Inspection Service, we either requeen (for managed hives) or euthanize (for feral colonies). A feral Africanized colony isn't suitable for live rehoming.

A note on the "killer bee" name #

The nickname came from US media in the 1970s and 1980s while the species spread through Central America toward the southern US border. The hype back then—Hollywood disaster flicks, sensational news specials, and predictions of mass casualties—didn't match what actually happened. Africanized bees can be dangerous, and yes, people have died from them, but the "apocalypse" narrative was way overblown.

Most entomologists now use "Africanized honey bee" or "African hybrid honey bee." This is a more accurate term that avoids the sensationalism often associated with them. Using the right name helps people understand the real risks involved instead of brushing off the topic as just another scare tactic.

Odd, funny, and genuinely true #

• Warwick Kerr, the scientist whose bees escaped, lived until 2018 (age 96) and remained a respected entomologist and a prominent political figure in Brazil for the rest of his life. He was briefly jailed for opposing the Brazilian military dictatorship in the 1960s. He always claimed the escape was the visitor's fault.
• Africanized bees are, by many metrics, better honey producers than European bees. They forage earlier in the day, at lower sucrose concentrations, and for longer hours. Across most of South and Central America, they have fully replaced European bees in commercial beekeeping — despite the challenges — because those who learned to manage them produce more honey.
• They will nest in truly unlikely places. Documented US finds include: a parked car's engine bay, a water meter vault 18 inches underground, the inside of an abandoned microwave, a hollow metal flagpole, a plastic 55-gallon drum, and the engine cover of a riding mower left in a shed for one season.
• The "one drop of scutellata blood" rule. Since workers from an Africanized colony only carry African genetics if the queen is Africanized, you can end up with a European-behaving colony whose drones are Africanized. This is important because the next queen — which will mate with local drones — will likely produce Africanized offspring. That’s why commercial beekeepers in these areas requeen aggressively every 1–2 years with certified European stock.
• A dish of diluted dish soap sprayed on a bee will kill it within about one minute by disabling the waxy coating that keeps insects from drying out. USDA research has shown that soap and water is a genuinely effective low-toxicity treatment for small numbers of exposed bees. It is not a DIY solution for a nest of thousands — that requires professional treatment with proper PPE.
• African elephants are afraid of Africanized bees — the same research that applies to European bees holds here, and even more strongly. A. m. scutellata is the specific subspecies whose playback recordings reliably drive elephants away. Some Kenyan farmers use the bees' nests strung on fences as living elephant deterrents.
• Africanized bees stopped spreading eastward at the Louisiana state line for about 15 years. Theories include higher rainfall, colder winters, and a "drone flooding" effect from the concentrated US managed-bee beekeeping industry, which outnumbered and outbred the spreading feral population. They eventually pushed through, reaching southwest Arkansas by 2005.
• No documented Africanized colony has survived a true northern winter