Wild Wonders of Europe / Lundgren / Two Common / Edible sea urchins (Echinus esculentus) on a rock with Klas Malmberg diving, house on the coast visible above surface, Saltstraumen, Bod, Norway, October 2008

Georgette Douwma / Edible / Common sea urchin {Echinus esculentus} on rock in kelp forest, UK.

Fred Bavendam / Purple Sea Urchin (Strongylocentrotus purpuratus) and Red Sea Urchin (Strongylocentrotus franciscanus) group, Channel Islands, California

Fred Bavendam / Green Sea Urchin (Strongylocentrotus droebachiensis) group and one Red Sea Urchin (Strongylocentrotus franciscanus), Quadra Island, British Columbia, Canada

Fred Bavendam / Sunflower Sea Star (Pycnopodia helianthoides) crawling amidst Kelp, Sponge, Sea Anemones, Sea Urchins, and a Sculpin, Quadra Island, British Columbia, Canada

Flip Nicklin / Purple Sea Urchin (Strongylocentrotus purpuratus) with tube feet extended into water to feed, California

Georgette Douwma / Radiant sea urchin {Astropyga radiata} with Cardinal fish Sulawesi Indonesia

Georgette Douwma / Purple sea urchins, California USA

Pascal Kobeh / Reef covered with two red Stomphia sea anemones (Stomphia coccinea), with Plumose anemones (Metridium senile), Red soft corals (Eunephthya / Gersemia rubiformis) and Green sea urchins (Strongylocentro...

Pascal Kobeh / Atlantic / Common rock crab (Cancer irroratus) on the reef in the middle of green sea urchins (Strongylocentrotus droebachiensis) Gulf of Saint Lawrence, Canada

Sergio Hanquet / Mass of Purple sea urchins (Sphaerechinus granularis) high numbers may be related reproduction cycle. Tenerife, Canary Islands.

Sergio Hanquet / Purple sea urchins (Sphaerechinus granularis), high numbers may be related reproduction cycle. Tenerife, Canary Islands.