Bert Willaert / Crown of thorns starfish (Acanthaster planci), Kimbe Bay, West New Britain, Papua New Guinea

Georgette Douwma / Martha Holmes with Crown of Thorns starfish (Acanthaster planci) on helmet. Australia. Filming for BBC NHU series Seatrek 1991

Georgette Douwma / Presenter Martha Holmes in bubble helmet with Crown of Thorns starfish (Acanthaster planci) Australia. Filming for BBC NHU series Seatrek 1991

Claudio Contreras / Crown-of-thorns Seastar (Acanthaster planci) detail, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), P...

Claudio Contreras / Crown-of-thorns Seastar (Acanthaster planci) detail, Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), P...

Claudio Contreras / Crown-of-thorns Seastar (Acanthaster planci) San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pac...

Georgette Douwma / Crown of thorns starfish (Acanthaster planci) Malapascua Island, Philippines, September

Bertie Gregory / Crown-of-thorns starfish (Acanthaster plancinorthern) at night, northern Red Sea.

Pascal Kobeh / Crown-of-thorns starfish (Acanthaster planci) eating the coral, an invasive species that damages coral reefs, Panama, Pacific Ocean

Georgette Douwma / Crown-of-thorns starfish (Acanthaster planci) next to a patch of coral it has preyed on. Only in Thailand are the Crown-of-thorns starfish this unusual colour. Andaman Sea, Thailand.

Georgette Douwma / Crown-of-thorns starfish (Acanthaster planci) next to a patch of coral it has preyed on. Only in Thailand are the Crown-of-thorns starfish this unusual colour. Andaman Sea, Thailand.

Pascal Kobeh / Diver in front of a Crown of Thorns starfish (Acanthaster planci) which is eating the polyps of a hard coral (Porites sp.) Egypt, Red Sea.