Honey bees are important pollinators that play a vital role in the reproduction of many plants. Their diet consists mainly of nectar and pollen, and they are known to have different feeding mechanisms depending on the resource conditions. A new study from researchers at the University of California, Berkeley, has used video recordings to show how honey bees switch between these feeding mechanisms.

The study, published in the journal "PNAS," found that honey bees use two main feeding mechanisms: the "proboscis extension reflex" and the "tongue-in-groove mechanism." The proboscis extension reflex is used when nectar is abundant, and it involves the bee extending its long tongue to reach the nectar. The tongue-in-groove mechanism is used when nectar is scarce, and it involves the bee inserting its tongue into the small grooves of flowers to extract the nectar.

The researchers conducted their study by filming honey bees as they fed on artificial flowers that contained different amounts of nectar. They found that the bees switched between the two feeding mechanisms depending on the amount of nectar available. When nectar was abundant, the bees used the proboscis extension reflex, and when nectar was scarce, they used the tongue-in-groove mechanism.

The researchers say that their study provides new insights into how honey bees adapt their feeding behavior to different resource conditions. This information could be useful in developing new strategies to help honey bees thrive in a changing environment.

In addition to the two main feeding mechanisms, the researchers also observed a third feeding mechanism that the bees used when nectar was very scarce. This mechanism involved the bees biting the flowers and then licking the nectar that oozed out.

The researchers say that their study is the first to provide a detailed analysis of the different feeding mechanisms used by honey bees. They hope that their findings will help to improve our understanding of how honey bees interact with their environment.