This bumblebee seems to be cleaning or adjusting one of his antennae and it caused me to wonder why. What are the antennae used for? Bumblebee.org had the answer—the antennae are used for smelling and touching. Taste and smell are conveyed to the bee through tiny hairs on the antennae.
Amazingly, bumblebees have a built-in antenna cleaner on each front leg, a notch between the metatarsus and the tibia. As bumblebee.org describes it, “The antenna is inserted into the notch then the metatarsus is bent enclosing the antenna. The antenna is then pulled through the notch and any debris or pollen is caught on the comb fringing the notch.” That site has lots more great information on the bumblebee, including electron microscope photos of the bee and a diagram of the antenna cleaner.
Bumblebee grooming an antenna
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Mike Powell 