Worker bee
Worker bee
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Worker bee

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Worker bee

A worker bee is any female bee that lacks the reproductive capacity of the colony's queen bee and carries out the majority of tasks needed for the functioning of the hive. While worker bees are present in all eusocial bee species, the term is rarely used (outside of scientific literature) for bees other than honey bees, particularly the European honey bee (Apis mellifera). Worker bees of this variety are responsible for approximately 80% of the world's crop pollination services.

Worker bees are the caste of bee that perform most of the fundamental tasks of the hive, and they are by far the most numerous type of bee. They are much smaller than drones or queen bees, with bodies specialized for nectar and pollen collection. They perform different tasks around the hive progressively over their lifespans in a predictable order based on their age.

Worker bees gather pollen in the pollen baskets on their back legs and carry it back to the hive where it is used as food for the developing brood. Pollen carried on their bodies may be transferred to another flower, where a small portion can rub off on the pistil, resulting in cross pollination. Nectar is sucked up through the proboscis, mixed with enzymes in the stomach, and carried back to the hive, where it is stored in wax cells and evaporated into honey.

Honey bee workers maintain the hive temperature in the critical brood area where new bees are hatched and raised. Workers must maintain the hive's brood chamber within a range of 34–36 °C (93–97 °F). If the chamber becomes too hot, the workers collect water or diluted nectar and deposit it around the hive, then fan the air with their wings to generate cooling by evaporation. If the chamber becomes too cold, worker bees can increase the temperature of their thoracic muscles using isometric contractions, pressing their warmed muscles against caps or walls of brood cells. In the wintertime, worker bees can cluster together to generate body heat to keep the brood area warm as external temperature decreases.

The life span of a worker bee fluctuates between the summer and winter months. In the summertime, worker bees typically only live two to six weeks compared to wintertime when workers can live up to 20 weeks. The reason for this difference lies in interior physiological processes that worker bees experience, and external factors, such as bees not leaving the relative safety of the hive during the colder winter months. Worker bees are exposed to a lot more risks during the summer months when they leave the hive to forage, and therefore have a shorter relative lifespan.

Honey bees begin as an egg laid by the queen in the brood nest, located near the center of the hive. Worker eggs are laid in smaller cells compared to drone eggs, and will hatch after three days into a larva. Nurse bees feed it royal jelly for three days, followed by pollen and honey for about two more days until the cell is capped by worker bees. The larva spins itself into a cocoon and becomes an inactive pupa. During this 10-day stage, the bee begins to develop features such as eyes, wings, legs and other features that adult bees possess. After this 21 day developmental period, the adult bee will chew through its wax cap and cocoon and emerge into the hive as a fully grown bee, immediately beginning its roles in the hive.

Through the lifecycle of a worker bee, she will take on many different roles within the hive, depending on how old she is and how long she has been working in the hive. The exact number of days she spends at each task depends on the requirements of the hive, however there is an estimated number of days each worker bee will spend at each task.

Brood cells must be cleaned before the next use. Worker bees in the cleaning phase perform this cleaning. Cells are inspected by the queen and if unsatisfactory, they will not be used. If the cells are not clean, the worker bee must repeat the cleaning process.

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