Wild Gorillas Observation

First observation of tool use in wild Gorillas
This article is about an observation of tool use in wild Gorillas (gorilla gorilla). The study took place in northern Congo where they found two adult female gorillas use branch and trunk to cross a swamp created by elephants during food processing. First observation was an adult female gorilla named Leah, used branch as walking stick to test out the water deepness to move forward in the swamp to get to her crying baby. At her first encounter with the swamp, she stares at the swamp for a while and started to test it out with her own body. She was fine with it until in the middle of the swamp the water level reach her middle body. She then turned around, and found herself a branch where she used