Lice on Hen (IMAGE) University of California - Riverside Caption This photo shows lice on a hen. The dark material on the feathers is "mite debris" (mite feces, mainly) from an earlier heavy mite infestation. The louse is, on average, 3 millimeters long. Credit B. Mullens, UC Riverside. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.