 Gorillas and humans also mature at different rates, so using a gorilla's chronological age to compute their IQ results in a score that is not very useful for comparative purposes.Researchers at The Gorilla Foundation said that Koko asked for a cat for Christmas in 1983.Ron Cohn, a biologist with the foundation, explained to the "Los Angeles Times" that when she was given a lifelike stuffed animal, she was less than satisfied.