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

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

SCOTLAND: The Big Picture / Horse mussel bed (Modiolus modiolus) with Brittle stars (Ophiothrix fragilis),Edible crab (Cancer pagurus) and Northern sea urchin (Strongylocentrotus droebachiensis) Sheltand Islands, Scotland, UK, S...

Scott Leslie / Winter Flounder (Pleuronectes americanus) camouflaged among Green Sea Urchins (Strongylocentrotus droebachiensis) barren, Passamaquoddy Bay, Maine

Scott Leslie / Northern Red Sea Anemone (Tealia felina) among Green Sea Urchins (Strongylocentrotus droebachiensis), Passamaquoddy Bay, Maine

Scott Leslie / Green Sea Urchin (Strongylocentrotus droebachiensis) barren with Orange-footed Sea Cucumber (Cucumaria frondosa), Passamaquoddy Bay, Maine

Scott Leslie / Common Shore Crab (Carcinus maenas) camouflaged amongst Green Sea Urchins (Strongylocentrotus droebachiensis) barren, Passamaquoddy Bay, Maine

Scott Leslie / Green Sea Urchin (Strongylocentrotus droebachiensis) barren, Passamaquoddy Bay, Maine

MYN / Jerry Monkman / Green sea urchin (Strongylocentrotus droebachiensiss) Rye, New Hampshire, USA, August. meetyourneighbours.net project

MYN / Jerry Monkman / Green sea urchin (Strongylocentrotus droebachiensiss) Rye, New Hampshire, USA, August. meetyourneighbours.net project

Jeff Rotman / Green sea urchins (Stronglyocentrotus droebachiensiss) scavenging and grazing, USA, North Atlantic Ocean.