Koko the gorilla signs up for dental treatment
The result? Her first full medical examination in about 20 years, an extracted tooth and a clean bill of health.
About a month ago, Koko, a 300-plus-pound ape who became famous for mastering more than 1,000 signs, began telling her handlers at the Gorilla Foundation in Woodside she was in pain. They quickly constructed a pain chart, offering Koko a scale from one to 10.
