Admixture in Africanized honey bees () from Panamá to San Diego, California (U.S.A.).

The Africanized honey bee (AHB) is a New World amalgamation of several subspecies of the western honey bee (), a diverse taxon historically grouped into four major biogeographic lineages: A (African), M (Western European), C (Eastern European), and O (Middle Eastern). In 1956, accidental release of experimentally bred "Africanized" hybrids from a research apiary in Sao Paulo, Brazil initiated a hybrid species expansion that now extends from northern Argentina to northern California (U.S.