SCOTLAND: The Big Picture / Common sunstar (Crossaster papposus) amongst hydroids (Nemertesia ramosa) and Jewel anemones (Corynactis viridis) with fish swimming in plankton bloom in background, South Arran Marine Protected Area,...

Roberto Rinaldi / Featherstars (Crinoidea) on sponge, Great Barrier Reef, Australia,

Juergen Freund / Crown of thorns starfish (Acanthaster planci) on top of a coral and digesting it with its stomach. Great Barrier Reef, Queensland, Australia.

Juergen Freund / Crown of thorns starfish (Acanthaster planci) on the side of a Platygyra coral and digesting it with its stomach. Great Barrier Reef, Queensland, Australia.

Pascal Kobeh / Diver above the reef with Caribbean sea whips (Plexaura homomalla), Elephant ear sponge (Agelas clathrodes) and a Great star coral (Montastraea cavernosa), San Salvador Island / Colombus Island, Baham...

Alex Mustard / Triplefin (Enneanectes sp) between the polyps of a great star coral (Montastraea cavernosa) East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Close focus wide angle view of a colony of Great star coral (Montastrea cavernosa). This photo is not digital manipulated, but taken with a fisheye lens placed very close to the coral with flashes aim...

Alex Mustard / Secretary blenny (Acanthemblemaria maria) young peering out of its tube on the surface of a great star coral (Montastraea cavernosa) East End, Grand Cayman, Cayman Islands, British West Indies. Caribb...

Alex Mustard / Great star coral (Montastraea cavernosa) photographed at night under blue light to excite the fluorescence, Little Cayman, Cayman Islands. Bristish West Indies, Caribbean Sea.

Alex Mustard / Great star coral (Montastrea cavernosa) at night, photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Great star coral (Montastrea cavernosa) at night, with polyps extended and feeding, photographed under blue light to excite the fluorescence, Little Cayman, Cayman Islands, British West Indies, Caribb...

Alex Mustard / Grey angelfish (Pomacanthus arcuatus) swimming over a colony of great star coral (Montastrea cavernosa) Georgetown, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.