Gorilla with Plant (image) University of California - Davis Share Print E-Mail Caption Mountain gorillas spend much of their time chewing and spitting out plants. Veterinary scientists found that collecting and analyzing the discarded plans can help them detect primate viruses. Credit Tierra Smiley Evans/UC Davis Usage Restrictions Provide credit Share Print E-Mail 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.