Juergen Freund / Timelapse of a Scolymia coral (Mussidae) feeding, lit with a UV light, Cairns, North Queensland, Australia.

Juergen Freund / Timelapse of a Scolymia coral (Mussidae) feeding, lit with a UV light, Cairns, North Queensland, Australia.

Linda Pitkin / Coral (Cynarina lacrymalis), on wreck of the SS Thistlegorm Sha'ab Ali, Gulf of Suez, Egypt, Red Sea.

Alex Mustard / Hard coral (Lobophyllia hemprichii) close up, Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Pascal Kobeh / Hard coral (Lobophyllia) half dead with fishes swimming around, Madagascar. Indian Ocean.

Pete Oxford / Reef showing diversity of coral, Fiji

Franco Banfi / Close up detail of hard coral, unidentified species, Maldives, Indian Ocean

Georgette Douwma / Hard coral (Lobophyllia hattai) and sponge, Rinca, Komodo National Park, Indonesia

Fred Bavendam / Stony Coral (Lobophyllia sp) colony showing bleaching in all but one of its large polyps, Lembeh Strait, Indonesia

Chris Newbert / Stony Coral (Lobophyllia sp) colony, Solomon Islands

Gary Bell/ Oceanwide / Stony Coral (Lobophyllia hemprichii), Great Barrier Reef, Australia

Pete Oxford / Coral (Mussidae), Raja Ampat Islands, Indonesia