Buff-tailed Bumble Bee Bombus terrestris

One of Europe's most abundant bumblebees, it's now commercially bred by the millions for greenhouse pollination worldwide. The queen mates with just one male her entire life, yet colonies thrive through cooperative brood care and strict division of labor. Workers are remarkably intelligent: they learn flower colors and improve foraging efficiency as they gain experience.

It's the eusocial success story—overlapping generations working together, females that can sting repeatedly, and behavioral sophistication that rivals far larger creatures. So commercially important they're now found on islands where they're not native, reshaping local ecosystems.