what the heck is this? huh? you don't? well, i guess you've never been to a beach enough to tell that these are actually 'holes' for you to 'fill in' whenever you see 'em. yup, i cant stop doing that and i know that i'm not the only one doing that. poor lil creature... it's sort of like a reflex action, cant help it!!! god save them lil crabs...