Gary Bell/ Oceanwide / Veined Octopus (Octopus marginatus) predating urchin, Anilao, Philippines

David Fleetham / Blue-spotted Sea Urchin (Astropyga radiata) expelling waste from the sac in the center of it's body. Maui, Hawaii.

Scott Leslie / American Lobster (Homarus americanus) feeding on sea urchin, Bonne Bay, Newfoundland, Canada

Andy Jackson / 2020VISION / Male Cuckoo wrasse (Labrus mixtus) feeding on a Sea urchin (Echinoidea), Lochgary Wreck, Kirkwall, Orkney, Scotland, UK, June.

Solvin Zankl / Spines of sea urchins from sand sample from Raja Ampat, Indonesia, the wide range of colours of these animals become visible. Diagonal of frame approx. 5 mm Digital focus stacking image

David Shale / Pencil urchin (Cidaroid). Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Pencil urchin (Cidaroid). Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

Alex Mustard / 2020VISION / Common sea urchins (Echinus esculentus) beneath a stand of kelp, Shetland Islands, Scotland, UK, North East Atlantic Ocean, April

Juergen Freund / Mahonia Na Dari (Guardian of the Sea) teacher Lorna Romaso leads a group of 16 students to snorkel and learn about the reef. West New Britain, Papua New Guinea, May 2010.

Juergen Freund / Coleman shrimp (Periclimenes colemani) on a Fire urchin (Asthenosoma varium) Moluccas Islands, Indonesia.

Juergen Freund / Zebra / Adam's urchin crab with eggs (Zebrida adamsii) on Fire sea urchin (Mespilia globulus), Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Carrier / Sea urchin crab (Dorippe frascone) carrying a fire urchin as a deterrent to predators. Lembeh Strait, North Sulawesi, Indonesia

Floris van Breugel / Giant Red Sea Urchins (Strongylocentrotus franciscanus) Purple sea urchins (Strongylocentrotus purpuratus) and Sea Anenomes (Anthopleura) underwater, in tide pools along Californian coastline, USA.

Thomas Lazar / American oystercatcher {Haematopus palliatus} feeding on Sea urchin, Florida, USA

Georgette Douwma / False fire urchin (Astropyga radiata) grouped on sandy bottom. Lembeh Strait, North Sulawesi, Indonesia.

Wild Wonders of Europe / Lundgren / Ratfish / Ghost shark (Chimaera monstrosa) swimming over Sea urchins, Trondheimsfjorden, Norway, February 2009

Wild Wonders of Europe / Lundgren / Edible sea urchin (Echinus esculentus) on Kelp, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Edible sea urchin (Echinus esculentus) on Kelp, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Two Atlantic wolffish (Anarhichas lupus) looking out of hole, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Atlantic wolffish (Anarhichas lupus) approaching Sea urchin, Saltstraumen, Bod, Norway, October 2008

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

Wild Wonders of Europe / Lundgren / Atlantic wolffish (Anarhichas lupus) feeding on Sea urchin, Saltstraumen, Bodö, Norway, October 2008

Wild Wonders of Europe / Lundgren / Atlantic wolffish (Anarhichas lupus) with Sea urchin in its mouth, Saltstraumen, Bodö, Norway, October 2008

Wild Wonders of Europe / Lundgren / Atlantic wolffish (Anarhichas lupus) feeding on Sea urchin, Saltstraumen, Bodö, Norway, October 2008

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.

Gary Bell/ Oceanwide / Sea Urchin (Toxopneustes pileolus), Anilao, Philippines

SCOTLAND: The Big Picture / Edible sea urchins (Echinus esculentus) grazing under a kelp forest, Scotland, UK, October.

Duncan Murrell / Sea urchins at low tide in the entrance channel to the Big Lagoon, Miniloc Island, Bacuit Archipelago, Palawan, the Philippines.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), two on rocks. Bird with Slate pencil urchin (Eucidaris sp) in beak with more Sea urchins below. Other bird sitting on nest. Punta Albemarle, Isabela Islan...

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) pair billing with Slate pencil urchins (Eucidaris sp) on rocks below. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) pair billing with Slate pencil urchins (Eucidaris sp) on rocks below. Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi) with Slate pencil urchins (Eucidaris sp). Punta Albemarle, Isabela Island, Galapagos.

Tui De Roy / Flightless cormorant (Phalacrocorax harrisi), pair at nest. Nest includes Seaweed, Sea urchins (Echinoidea) and Starfish (Asteroidea). Punta Albemarle, Isabela Island, Galapagos.

David Fleetham / Detail of Long-spined Sea Urchin (Diadema savignyi), endemic to the southern Pacific, but is rare in Hawaii. Maui.

David Fleetham / Detail of Blue-spotted Sea Urchin (Astropyga radiata). A rare visitor to Hawaii.

David Fleetham / Close look between the spines of Slate pencil sea urchin (Heterocentrotus mammillatus), Hawaii.

David Fleetham / Adam's urchin / Zebra crab (Zebrida adamsii) carrying eggs under its body on a venomous Radiant sea urchin (Astropyga radiata). Rinca island, Komodo National Park, Indonesia.

David Fleetham / Slate pencil sea urchins (Heterocentrotus mammillatus) in reef scene, Hawaii.

David Fleetham / Slate pencil sea urchins (Heterocentrotus mammillatus), pennantfish / bannerfish (Heniochus diphreutes) and moorish idols (Zanclus cornutus) on reef, Hawaii.

David Fleetham / Red liomera crab (Liomera rubra) female holding a tail full of eggs in a slate pencil sea urchin (Heterocentrotus mammillatus) at night, Hawaii.

Alex Mustard / Pair of Coleman shrimps (Periclimenes colemani) make their home in a fire urchin (Asthenosoma varium). The female is larger. Fire urchins are one of the largest and most venomous urchins, their bright...

Alex Mustard / Pair of Coleman shrimps (Periclimenes colemani) living in a fire urchin (Asthenosoma varium). The female is the larger shrimp. Fire urchins are one of the largest and most venomous urchins, their brig...

Franco Banfi / Yellow-striped cardinalfish (Ostorhinchus / Apogon cyanosoma) and Narrow-lined cardinalfish (Archamia fucata) shoal amongst Sea urchins (Echinothrix diadema) spines, Lazi Pier, Dumaguete, East Negros...

Franco Banfi / Green moray (Gymnothorax castaneus) with sea urchins and Guadalupe cardinalfish (Apogon guadalupensis) Malpelo Island National Park, UNESCO World Heritage Site, Colombia, East Pacific Ocean

Franco Banfi / Green moray (Gymnothorax castaneus) with sea urchins and Guadalupe cardinalfish (Apogon guadalupensis) Malpelo Island National Park, UNESCO World Heritage Site, Colombia, East Pacific Ocean

Jan Wegener/ BIA / American Oystercatcher (Haematopus palliatus) feeding on sea urchin prey, Florida

Constantinos Petrinos / Aggregation of Blue-spotted urchins (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Aggregation of Blue-spotted urchins (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Radiant sea urchins (Astropyga radiata) home toZebra urchin crab (Zebrida adamsii) and banggai cardinalfish (Pterapogon kaudemi) with schooling silversides behind, in shallow water. Bitung, North Sul...

SCOTLAND: The Big Picture / Edible crab (Cancer pagurus) semi buried in the seabed amongst boulders with sea urchins and sunfish in background, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

Richard Herrmann / Red Sea Urchin (Strongylocentrotus franciscanus) and Purple Sea Urchin (Strongylocentrotus purpuratus) feeding on Southern Sea Palm (Eisenia arborea) creating urchin barren, Santa Cruz Island, Channel...

Georgette Douwma / Longspine urchins (Diadema setosum) Cebu, Malapascua Island, Philippines, September

Alex Mustard / A view through Kelp forest (Laminaria hyperborea) with Common sea urchins (Echinus esculentus) grazing on the algae, Farne Islands, Northumberland, UK, North Sea, August

Albert Lleal / Common Sea Urchin (Paracentrotus lividus) in fast moving water showing spines and tube feet, the water penetrates the urchin and provides oxygen, Catalonia, Spain

Albert Lleal / Common Sea Urchin (Paracentrotus lividus) in fast moving water showing spines and tube feet, the water penetrates the urchin and provides oxygen, Catalonia, Spain

Norbert Wu / Purple Sea Urchin (Strongylocentrotus purpuratus) group feeding on Giant Kelp (Macrocystis pyrifera), creating urchin barren, California

Norbert Wu / Brittle Star (Ophiothrix spiculata) group and Purple Sea Urchins (Strongylocentrotus purpuratus), California

Pascal Kobeh / Colony of Red sea urchins (Strongylocentrotus franciscanus) at the feet of Bull kelps (Nereocystis luetkeana) Vancouver Island, British Columbia, Canada. Pacific Ocean.

Pascal Kobeh / Brittle stars, sea urchins and a shell on the sea floor. Antarctic peninsula, Bellingshausen Sea.

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

Scott Leslie / American Lobster (Homarus americanus) feeding on sea urchin, Bonne Bay, Newfoundland, Canada

Franco Banfi / Remains of sea urchins and shells on beach, Punta Espinosa, Fernandina Island, Galapagos Islands, East Pacific Ocean

Georgette Douwma / Collector urchin (Tripneustes gratilla)Debris tends to 'collect' on these urchins, hence their name. Mabul, Malaysia. Indo-Pacific.

Albert Lleal / Sea Urchin (Cidaris cidaris) spicules and spines, seen under SEM, 150x magnification

Andy Jackson / 2020VISION / Three Ballan wrasse (Labrus bergylta) feeding on a Sea urchin (Echinoidea), Fetlar, Shetland, Scotland, UK, June.

Andy Jackson / 2020VISION / Close-up of a Ballan wrasse (Labrus bergylta) swimming and feeding on a Sea urchin (Echinoidea), Fetlar, Shetland, Scotland, UK, June.

Andy Jackson / 2020VISION / Pair of Cuckoo wrasse (Labrus mixtus) and a Ballan wrasse (Labrus bergylta) feeding on a Sea urchin (Echinoidea), Lochgary Wreck, Kirkwall, Orkney, Scotland, UK, June.

Andy Jackson / 2020VISION / Tracking shot along vertical rock faces with Jewel sea anemones (Corynactis viridis), dead man's fingers (Alcyonium digitatum) and Sea urchins (Echinoidea), Out Stack, Shetland, Scotland, UK, June. Se...

Andy Jackson / 2020VISION / Tracking shot along vertical rock faces with Jewel sea anemones (Corynactis viridis), dead man's fingers (Alcyonium digitatum) and Sea urchins (Echinoidea), Out Stack, Shetland, Scotland, UK, June. Se...

Andy Jackson / 2020VISION / Tracking shot along vertical rock faces with Jewel sea anemones (Corynactis viridis), dead man's fingers (Alcyonium digitatum) and Sea urchins (Echinoidea), Out Stack, Shetland, Scotland, UK, June. Se...

Pascal Kobeh / Underwater reef covered with a colony of Red sea urchins (Strongylocentrotus franciscanus), Alaska, USA, Gulf of Alaska. Pacific ocean.

Jonas Landolt / Herring Gull (Larus argentatus) flying with urchin prey, Varanger, Norway

Pascal Kobeh / Poisonous sea urchin (Toxopneustes pileolus / roseus) can be lethal if touched, Baja California peninsula, Mexico. Sea of Cortez.

Pascal Kobeh / Honeycomb moray (Gymnothorax favagineus) with sea urchins spines on its head among mushroom leather coral (Sarcophyton ), Daymaniyat islands, Oman. Gulf of Oman.

Pascal Kobeh / Two Stimpson's snapping shrimps (Synalpheus stimpsoni) in a crinoid / feather star, Manado, Indonesia. Sulawesi Sea.

Pete Oxford / Sea urchins being sold in market, Suva, Viti Levu, Fiji

Jan Wegener / Willet (Tringa semipalmata) foraging on an urchin, Florida

Michele Westmorland / Moray Eel (Gymnothorax prasinus) with Rock shrimps (Lysmata sp) in urchins and sponge encrusted rocks. Galapagos Islands.

MYN / Dimitris Poursanidis / Purple sea urchin (Paracentrotus lividus) beached, Crete, meetyourneighbours.net project

Franco Banfi / Dish of Sea Urchins in restaurant, Ischia Island, Italy, Tyrrhenian Sea, Mediterranean