Gorilla Size Study (2 of 2) (IMAGE) Wildlife Conservation Society Caption From 1995 until 2007, the team followed the lives of 19 adult male western lowland gorillas and their family groups from observation platforms with telescopes and cameras, tracking the number of females each male mated with, and the number of offspring produced by each adult male and their survival. Credit Thomas Breuer/WCS Usage Restrictions One-time usage only. Must use with the following credit: Thomas Breuer/WCS. 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.