Sana Inoue and Tetsuro Matsuzawa of Kyoto University showed a computer screen grid of nine numbers to six chimpanzees. The chimps were previously trained to recognize the ascending nature of the numbers. They were also shown to nine college students. When subjects touched one of the numbers, all of the others vanished. They then had to touch the squares in the order of the numbers that used to be there.

When the numbers flashed for just four-tenths of a second or less, one of the chimps beat all of the college students.

Here's the press release from 'Current Biology', a publication of Cell Press: