At a more advanced stage of sociality are the bumblebees. Here again the nest is founded in spring by a single female. But unlike the offspring of the Halictus bee, the young that hatch from the founding bumblebee's eggs do not become reproductive in their own right; they serve as workers, enlarging the nest, gathering nectar and pollen, and caring for the young that hatch from later eggs laid by the founder. The founder, who remains in the nest as the queen, now devote almost all her energy to egg laying. Eventually there may be several hundred, or even a thousand bees in the colony.