The raw materials for honey are sugary substances that can be found in nature: flower nectar or honeydew, a secretion produced by insects that feed on plant sap. They are collected by foraging bees, which store them in the honey bag. The pocket has a capacity of about 70 milligrams. Return to the comb, the foragers pass the load to the workers and the nectar is transferred from one bee to another. At each step it is enriched with secretions of the mouth, rich in enzymes. The workers lay the drop in a cell and, by waving their wings, they make the excess water evaporate. Thanks to the saliva enzymes, the honey matures and after a few days it is ready. Other apids (the bee family) can produce honey: they are the bumblebee (Bombus terrestris) and the anthophora (Anthophora acervorum).