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

Constantinos Petrinos / Yellow stripe clingfish (Diademichthys lineatus) living in association with the Fire Urchin (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.

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

Alex Mustard / 2020VISION / Common / Red sunstar (Crossaster papposus) amongst Dead man's fingers (Alcyonium digitatum) on a rocky reef, beneath kelp. Shetland Islands, Scotland, UK, June.

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.

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 / Edible sea urchin (Echinus esculentus) on Kelp, Saltstraumen, Bod, Norway, October 2008