Koko is a western lowland gorilla kept in San Francisco.
There are many claims about her IQ.
She was given IQ tests several times when she was younger and scored between 70 and 95, where 100 is considered normal for humans. Her carers insist she is not, however, a 'genius' gorilla, just typical for her species …
Is there any backing source for this? Which IQ tests (Raven's matrices? Wechsler's test? Or something else?) has she been tested with?