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This blue-spotted sea urchin, Astropyga radiata, is currently expelling waste from the sac in the center of it's body, Maui, Hawaii.
No usage of this image, of any kind, is granted without the express written consent of David Fleetham.
© David Fleetham Underwater Photography
firstname.lastname@example.org 808-283-1154 Maui, Hawaii, USA.