Bees are part of the order Hymenoptera, along with wasps and ants. Bees evolved from ancient predatory wasps that lived 120 million years ago. Like bees, these wasps built and defended their nests, and gathered food for their offspring. But while most bees feed on flowers, their wasp ancestors were carnivorous. They stung and paralyzed other insects, bringing them back to feed developing offspring in the nest.