Reference19 Jan 2010 04:34 am
The orchid bees include a number of primitively eusocial species with similar biology. A few species have long active seasons and attain colony sizes in the hundreds. Most species have a single season colony cycle, even in the tropics, and only mated females hibernate. The only physical difference between queens and workers is average buy honey bees size, if they differ at all. Colonies are typically small, with a dozen or fewer workers, on average. The biology of most such species is almost completely unknown. There are many more species of primitively eusocial bees than highly eusocial bees, but they have rarely been studied.