Bora Bora. Smaller than a quarter (or than a 20 cent euro, if you want :P), this tiny creature is extremely fast! I didn’t have the time to estimate its speed, but it was definitely faster than my eyes! Add this to the fact that it’s very difficult to see him against the sand. Googling around, I found that it’s named “ghost crab” and that combats between males are highly ritualized and rarely ends with contact!
This image is a crop of the original. :)