Fruit fllies are notorious for showing up just as fruit begins to rot. Prior research has found they are able to smell the ethanol from a great distance and that the flies both eat the rotting fruit and use it as a repository for their eggs. In this new effort, the researchers have found that the flies are also able to determine the level of ethanol in the fruit and to move on if it’s not just right for the best development of their offspring. Too little ethanol, the researchers report, results in too-heavy offspring that have difficulty flying. Too much ethanol causes a delay in development which reduces their chances of reproducing. The right amount is apparently 5%—about the same as beer.
Read more at: Phys.org