Nectar is high in both water content and natural yeasts which, unchecked, would cause the sugars in the nectar to ferment.[13] After the final regurgitation, the honeycomb is left unsealed. Bees inside the hive fan their wings, creating a strong draft across the honeycomb which enhances evaporation of much of the water from the nectar.[13] The reduction in water content raises the sugar concentration and prevents fermentation. Ripe honey, as removed from the hive by the owner of the bees, has a long shelf life and will not ferment.