Some flowers are pollinated using buzz pollination. In some plants, the pollen in the anther is less accessible. The anther is typically tubular, with only an opening at one end. In order to release the pollen, the bumble bee grabs onto the flower and moves its flight muscles, causing the flower and anther to vibrate, dislodging pollen. This is called buzz pollination. The honeybee rarely performs buzz pollination. About 8% of the flowers of the world are pollinated using buzz pollination. The following plants are pollinated by buzz pollination: