Female bumblebees can sting repeatedly, but generally ignore humans and other animals. Cuckoo bumblebees do not make nests; their queens aggressively invade the nests of other bumblebee species, kill the resident queens and then lay their own eggs, which are cared for by the resident workers. read more
Bumble bee colonies are organized around a queen bee, who can also sting, drones (male bees) and worker bees. Worker bees are sterile females, and are able to sting because the ovipositor has evolved into a stinger. read more