Researchers in Japan have found that chimps have better short term memory then humans. Most people, including some biologists and psychiatrists, believe that human cognitive skills are far better then that of any primate, but according to the research of Dr. Tetsuro Matsuzawa of the Kyoto University in Japan, this is not the case. Dr. Matsuzawa's results will be published in the Current Biology journal.
Check out Ali's page, the chimp in question, for some pretty cool videos of his memory skills.
If you have trouble believing that we might not be the smartest primates on this planet, you have to admit that we are at least getting dumber.