Diff — Africanized honey bee

{{infobox

| title = Africanized honey bee

| origin = Escaped experimental colonies, Brazil — 1957

| us_arrival = October 1990 — Hidalgo, Texas

| us_range = ≈ 10 southern-tier states — TX, NM, AZ, CA-S, NV, UT, OK, AR, LA, FL

| temperament = Defensive — faster, farther, more persistent nest defense

| nickname = "Killer bee" — media term; venom identical to European bees

}}

The **Africanized honey bee** is the most famous unintended introduction in American beekeeping — a defensive hybrid that escaped a Brazilian breeding program in 1957, colonized the Americas at a few hundred kilometers a year, crossed into Texas in 1990, and now dominates [[feral honey bee|feral populations]] across the U.S. southern tier. It is the same species as every other honey bee on the continent; what differs is how hard it defends its home.[[cite: Kerr program history; USDA ARS spread records]]

## An experiment that walked away

The hybrids spread at roughly **300–400 km per year** — swarm-driven, taking over feral niches and hybridizing with or out-competing the European feral stock. They moved through South America in the 1960s–70s, crossed Central America in the 1980s, entered Mexico, and in **October 1990** the first confirmed U.S. swarm was captured near Hidalgo, Texas.[[cite: USDA APHIS spread chronology]]

## What "Africanized" actually means

The "killer bee" reputation rests on a real behavioral difference with a misleading label:

* **Same venom, same sting** — an Africanized sting is chemically identical to a European bee's

* **Different threshold** — colonies respond to disturbance faster, with more bees, and pursue farther — hundreds of meters in documented incidents

* **More colonies near people** — higher swarming and absconding rates mean more nesting in structures

The result is not more lethal stings per bee, but many more stings per incident. Documented attacks have killed people and animals — a number of documented human deaths in the U.S. since 1990, and considerably more livestock and pets — almost always where a colony was disturbed or approached unawares.[[cite: attack-incident literature; USDA guidance]]

## How they win

Africanized biology tilts to speed: slightly faster development, higher swarming and absconding rates, and the ability to **usurp** — small Africanized swarms move into European-managed hives, replace the queen, and take over. Africanized drones' edge in mating gradually shifts the feral gene pool their direction. Ironically the same traits make them somewhat more resilient to [[varroa destructor]] — hygiene and frequent re-nesting interrupt the mite's cycle — and superbly adapted to warm, sparse-forage conditions.[[cite: comparative-biology literature]]

## Range and the northern edge

Established populations now span about **ten southern states** — Texas, New Mexico, Arizona, southern California, Nevada, Utah, Oklahoma, Arkansas, Louisiana, and Florida — with the northern boundary set by winter survival, not behavior. Africanized colonies overwinter poorly in cold climates, which is why the "killer bees are coming north" headlines of the 1990s did not materialize: the line has held near the southern tier for thirty years.[[cite: USDA range maps; overwintering studies]]

## Living with them

In Africanized range, the rules of coexistence are the removal industry's: check before disturbing cavities and equipment, treat a massed colony as hazardous rather than curious, and call trained removal rather than approaching a [[honey bee infestation|structural colony]] with a can of spray — the majority of serious sting incidents in these states begin exactly that way.[[cite: removal-industry guidance; public-safety advisories]]

## References

- Kerr breeding-program history; USDA APHIS/ARS spread records

- Sanford / Hall — Africanized bee biology and management literature

- Incident and fatality reviews (CDC/state health departments)

- Overwintering-range studies

## See also

* [[Feral honey bee]] — the wild population it dominates

* [[Honey bee infestation]] — removal in Africanized territory

* [[Honey bee introduction to the Americas]] · [[Honey bees in North America]]

* [[Varroa destructor]] — the parasite it resists better

[[Category:Nature]]

[[Category:Science]]

[[Category:History]]