Gorillas and Chimpanzees Study in Western Equatorial Africa (video) Wildlife Conservation Society Share Print E-Mail Loading video... Caption A massive decade-long study of Western Equatorial Africa's gorillas and chimpanzees has revealed that there are one third more western lowland gorillas and one tenth more central chimpanzees than previously thought. Unfortunately, the vast majority of these great apes (80 percent) exist outside of protected areas, and gorilla populations are declining by 2.7 percent annually. Credit C. Sanz (WCS, Washington Univ.) and D. Morgan (Lincoln Park Zoo). Usage Restrictions One-time usage only. 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.