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 (search) in Woodside she was in pain. They quickly constructed a pain chart, offering Koko a scale from one to 10.
When Koko started pointing to nine or 10 too often, a dental appointment was made. And because anesthesia would be involved, her handlers used the opportunity to give Koko a head-to-toe exam.
"She's quite articulate," volunteer Johnpaul Slater said. "She'll tell us how bad she's feeling, how bad the pain is. It looked like it was time to do something."
Twelve specialists -- a Stanford cardiologist, three anesthesiologists, three dentists, an ear and throat specialist, two veterinarians, a gastroenterologist and a gynecologist -- volunteered to help.
"It's not often that we get to work on a celebrity," said Dr. David Liang, assistant professor of medicine at Stanford. "Probably, Koko is less demanding."
The team came to Koko Saturday, bringing portable X-ray and ultrasound machines. They set up shop at her "apartment," which looks like a remodeled box car, complete with a makeshift toilet, television, DVD player and lots of toys.
After four hours of tests -- including a colonoscopy, gynecological exam, dental work, X-rays, and ultrasounds -- doctors pronounced her fit.
Koko, who celebrated her 33rd birthday July 4, was due for a checkup. While gorillas in captivity are known to live into their 50s, they are susceptible to heart disease and a thickening of the arteries.
Koko and Ndume, her partner of 11 years (he doesn't "speak"), have been trying unsuccessfully to have a baby, and the doctors thought the checkup could let them know whether she had any biological problems preventing it. She doesn't.
Her teacher, Francine Patterson, was at her side when the anesthesiologist prepared to put her under in the morning, and apparently Koko asked to meet her specialists.
They crowded around her, and Koko, who plays favorites, asked one woman wearing red to come closer. The woman handed her a business card, which Koko promptly ate.
Otherwise, Koko was calm, Liang said.
The Gorilla Foundation has studied gorilla intelligence by teaching American Sign Language to Koko and another gorilla, Michael, who died in 2000.