Some metropolitan areas contain metropolitan divisions. Two metropolitan divisions exist within the DallasâFort WorthâArlington MSA. The term metropolitan division is used to refer to a county or group of counties within a metropolitan area that has a population core of at least 2.5 million.
The bees carry the propolis back to their hives and mix it with their salivary secretions and wax flakes. Propolis contains 55% resins and balsams, 30% beeswax, 10% etheric oils, and 5% pollen.
Workers forage first for either pollen or nectar. They may change from one to the other but usually collect pollen first and nectar later. The nectar collectors may also collect water when the colony needs it, and a few bees collect plant resins called propolis or bee glue. Workers live 4 to 6 weeks during the active season. Those reared in the fall may live as long as 6 months, allowing a new generation to develop in the spring before they die.