Ant Toilets (IMAGE) PLOS Caption Here are 21 plaster nests which had been inhabited by 150-300 Lasius niger workers for two months. Dark colored patches (= toilets) can be seen in every nest. The color of the patch corresponds to the color of the sugar solution the ants were fed. Credit Czaczkes et al. Usage Restrictions CC-BY 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.