Leaving a message (IMAGE) Michigan State University Caption A giant panda in China's Wolong Nature Reserve rubs scent glands against a tree used by the animals to leave messages about their status. Credit Camera trap photo courtesy of Jindong Zhang Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.