I previously considered Hindu-Arabic numeral memory to be an anthropocentric process however young chimpanzee have outperformed University students at this very task.
To see if you have a better short term memory than Ayumu the chimpanzee, try this test: http://gamesamurai.net/3409-Are-you-smarter-than-a-chimp.html
If the above link doesn’t load, a simple version of the game (you need to set it to 0.2 seconds to complete the chimp’s challenge) can be found here: https://adambrown.info/p/humor/monkey
The test involves recalling in their correct position and ascending order, the numbers that flash up on the screen.
The highest score I can achieve is 6. Ayumu the chimpanzee averages 8 correct.
I strongly recommend watching this video as it defies belief.
The test results suggest that young chimpanzees have a superior eidetic memory to university students. An article full of details about the memory test can be found here: http://www.newscientist.com/article/mg19626332.900-chimps-outperform-students-in-a-memory-game.html