Figure 4. A young orchid bee nest constructed inside an empty nucleus colony box (a beekeeping hive box half as wide as a typical hive box used for housing small honey bee colonies) (a). The top has been removed revealing three cells under construction by a female green orchid bee (b). The entrance has been sealed off with propolis (plant resins) except for a small hole allowing entry for the female bee (c).
Credit: Aaron Mullins, University of Florida, Ft. Lauderdale Research and Education Center