Jane Goodall first documented that wild chimpanzees occasionally hunt and eat small mammals. Now, there's evidence raising the possibility gorillas also eat small vertebrates such as monkeys and antelope -- but the researchers involved say more study is needed. The study was intended to examine bonobos' meat-eating habits, using gorillas in Loango National Park in Gabon as a control. The evidence showed animal DNA infeces of both control and study groups.

Read more and see a beautiful gorilla portrait at National Geographic News.

Read the study on PLoS ONE ("an interactive open-access journal for the communication of all peer-reviewed scientific and medical research").