<i>Apoica pallens</i> (IMAGE) University of Washington Caption Apoica pallens wasps at their nest in the afternoon. The species is nocturnal -- unusual for social wasps -- and foragers hunt at night. The photo was taken in a tropical rainforest in Corcovado National Park, Costa Rica. Credit Sean O’Donnell, University of Washington. 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.