About Koko's IQ tests:

https://skeptics.stackexchange.com/questions/32155/does-the-gorilla-koko-have-an-iq-in-the-range-70-95

This is interesting:

Over the years other apes have been administered intelligence tests. An orang once reportedly scored about 200 on an infant intelligence test, a result that may have said more about the orang’s faster maturing motor control than its reasoning abilities, although there is no question that oranges are bright. Viki, the female chimp who was the subject of an early attempt to teach spoken language to an ape, was given a number of intelligence tests and performed quite well. She did better than a control group of human infants up to the age of eighteen months, and matched their performance until about age three. Source: Koko.org

According to your logic Orangutans are much species than humans.