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Purple Sea Urchin
Spines have more uses
than one would think.
Sure, they defend against sea otters
and the voracious stars.
Ball-jointed, they swivel to catch
pieces of floating algae
for the shorter, two-
fingered pedicellines to convey
to the bottom-scraping mouth
& its five sharp pyramids.
They are digging bars.
A purple urchin can excavate
a hollow into solid rock.
If it starts too young, it may become stuck,
entombed. Some never dig at all,
& wander slow as time