http://news.nationalgeographic.com/news/2010/03/100305-first-proof-gorillas-eat-monkeys-mammals-feces-dna/
First Proof Gorillas Eat Monkeys?
Mammal DNA in gorilla feces hints the big apes might eat meat after all.
http://news.nationalgeographic.com/news/2010/03/100305-first-proof-gorillas-eat-monkeys-mammals-feces-dna/