Alex Mustard / A diver exploring a coral reef with formation of brown tube sponges (Agelas conifera) red rope sponges (Amphimedon compressa) and deepwater sea fans (Iciligorgia nodulifera) East End, Grand Cayman, Ca...

Alex Mustard / Secretary blenny (Acanthemblemaria maria) making a home in a deserved worm tube of a great star coral (Montastraea cavernosa), East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Se...

Juergen Freund / Orange cup coral (Tubastrea faulkneri) with polyps open, Batangas, Philippines.

Juergen Freund / Orange cup coral (Tubastrea faulkneri) detail of mouth and tentacles, Batangas, Philippines.

Juergen Freund / Tube corals {Tubastrea faulkneri} with polyps open, Indo-Pacific

Doug Perrine / Bottlenose dolphin {Tursiops truncatus} Cayman Islands, Caribbean Sea (Non-ex).

Doug Perrine / Bottlenose dolphin {Tursiops truncatus} Cayman Islands, Caribbean Sea (Non-ex).

Juergen Freund / Tube coral (Dendrophyllia) Philippines, Pacific Ocean

Jeff Rotman / Cup coral {Tubastrea sp} feeding on Silverside fish at night, Red Sea

Pascal Kobeh / Hard coral (Porites lutea) with Christmas-tree worms (Spirobranchus giganteus), New Caledonia, Pacific Ocean.

Alex Mustard / Large green branching coral (Tubastrea sp.) with damselfish on a coral reef. Misool, Raja Ampat, West Papua, Indonesia. Misool Marine Protected Area. Ceram Sea. Tropical West Pacific Ocean.

Magnus Lundgren / Wild Wonders of China / Yellow tube coral (Tubastrea faulkneri) with the polyps open, Ninepin Group or Kwo Chau Islands, Hong Kong, China.