(1) Waxes Explanation: Insects and birds have the simplest surface waxes that serve to water proof feathers. These consist of long chain hydrocarbons. The interlocking feather barbs and a special waxy coating create a shield that water runs off of. Besides, while a few components present in surface lipids can prevent growth of pathogens, the total surface was layer certainly functions to prevent microbial entry into the organism.