One day later . . .

This is yesterday's crab - today.  The colour is the most obvious difference, but it has also started to come apart and will soon be gone.

Info on aama crab molts.

Edit:  Got a response from Susan Scott (info above).  She says Hawaii has 5 species of rock crabs.  The molts turn red from the heat of the sun and therefore a new molt might have some of its original colour in it (black, green).   Now we know.  I love to see them and will surely blip them again.