Scribbles in the Sand

Olivella biplicata, the purple olive, ploughs a crazy quilt of trails on intertidal sands. A good low tide will reveal Olivella’s handiwork on most any exposed Pacific beach between southern Alaska and Baja California.

What motivates the shape of the trails?

Have a look at the purple olive, a little intertidal snail, only an inch long.

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Olivella biplicata on the move

The purple olive, Olivella biplicata
Last low tide Olivella left me these and I’m posting them as my response to Numbers.