Census Team (image) Wildlife Conservation Society Caption WCS researcher Deo Kujirakwinja (in center with blue shirt) trains census participants on how to collect data on gorilla nests (at the feet of the group in this image). Researchers calculate gorilla densities using nest counts and dung piles. Credit A. Plumptre/Wildlife Conservation Society Usage Restrictions One time usage only. Must use the following credit: A. Plumptre/Wildlife Conservation Society 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.