A massive study finds 360,000 more gorillas and nearly 130,000 more chimpanzee than expected living in Western Africa. The total field time spent collecting data for the study totaled 61,000 days. Researchers walked more than 5,400 miles while collecting data on great ape nests.

See the source article by following the link below:
A massive study finds 360,000 more gorillas and nearly 130,000 more chimpanzee than expected living in Western Africa. The total field time spent collecting data for the study totaled 61,000 days. Researchers walked more than 5,400 miles while collecting data on great ape nests.