The Associated Press
NEW YORK -- Think you're smarter than a fifth-grader? How about a 5-year-old chimp? Japanese researchers pitted young chimps against human adults in tests of short-term memory, and overall, the chimps won.
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One memory test included three 5-year-old chimps who'd been taught the order of Arabic numerals 1 through 9, and a dozen human volunteers.
They saw nine numbers displayed on a computer screen. When they touched the first number, the other eight turned into white squares. The test was to touch all these squares in the order of the numbers that used to be there.
Results showed that the chimps, while no more accurate than the people, could do this faster.
The article goes on to explain another test where numbers are only briefly flashed on the screen and subjects must remember which numbers were located where and the Chimps did better at this too. Pretty amazing stuff.
I have heard that Chimps are faster at performing simple mental math as well but I don't have anything to back that up.
Original article can be found here