Digital cameras are opening up new avenues for understanding our world. Today I discovered that I can track individual fiddler crabs using the pattern on their backs. I first photographed this crab on 18 April 2014 and then yesterday on 4 April 2015. This is clear evidence that some fiddler crabs live at least a year.
|Adult male Uca triangularis in April 2014|
Same crab in same place in April 2015
The ground is a little different between photos too. In the first photo, the ground had just been scoured by a flood associated with a cyclone. In the second photo, sand has returned to the substrate and has covered up the exposed roots.