The honey bee dances beautifully among the flowers, sucking the nectar from the flowers. Bees feed on nectar and pollen, nectar primarily as a source of energy. Pollen is mostly used as food for their larvae. Vertebrate predators of bees include some primates and birds such as bee-eaters. Insects such as the beekeeper and the miller are also predators of bees.Due to the great importance of bees in pollination and increasing the fertility of agricultural products and fruits, the Food and Agriculture Organization of the United Nations (FAO) has named May 20 of each year as "World Bee Day".