However what they didn't understand at first that bumblebees don't actually fly, they levitate.
Inside a bumblebee there is a hollow cavity next to the larynx. When bees move their wings, the cavity start resonating the same resonance as the Earth's magnetic field at 7.83Hz.
The bee then becomes a free-agent inside a magnetic field, making the bumblebee able to levitate.
Credit to Telegram post @awakenedspecies