Alex Mustard / Red gorgonians (Lophogorgia chilensis) growing beneath a Giant kelp (Macrocystis pyrifera) forest, with female California sheephead (Semicossyphus pulcher). Santa Barbara Island, Channel Islands. Los...

Alex Mustard / Red gorgonian (Lophogorgia chilensis) growing beneath a forest of giant kelp (Macrocystis pyrifera), with female California sheephead fish (Semicossyphus pulcher). Santa Barbara Island, Channel Island...

Alex Mustard / Red gorgonian (Lophogorgia chilensis) growing beneath a forest of Giant kelp (Macrocystis pyrifera). Santa Barbara Island, Channel Islands. California, USA. North East Pacific Ocean.

Franco Banfi / Red gorgonian coral (Lophogorgia chilensis) and Yellow gorgonian (Eunicella cavolini) growing in a rock crevice, Ponza Island, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Scuba diver with Red gorgonian coral (Paramuricea clavata), Santa Teresa, Sardinia, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Yellow gorgonian (Eunicella cavolini), Vis Island, Croatia, Adriatic Sea, Mediterranean

Franco Banfi / Scuba diver with Red gorgonian coral (Lophogorgia chilensis), Ponza Island, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Scuba diver with Red gorgonian coral (Lophogorgia chilensis), Punta Campanella Marine Reserve, Massa Lubrense, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Wide angle of a group of Sea stars (Hacelia attenuata), Vis Island, Croatia, Adriatic Sea, Mediterranean.

Franco Banfi / Yellow gorgonian (Eunicella cavolini) covered with mucilage, a symptom of rising sea temperature, Vis Island, Croatia, Adriatic Sea, Mediterranean.

Franco Banfi / Mucilage covering a reef, Vis Island, Croatia, Adriatic Sea, Mediterranean.

Franco Banfi / Red gorgonian coral (Paramuricea clavata) covered in mucilage, a symptom of rising sea temperature, Punta Campanella Marine Reserve, Massa Lubrense, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Two Red sea-squirts (Halocynthia papillosa) on a Yellow gorgonian (Eunicella cavolini), Punta Campanella Marine Reserve, Massa Lubrense, Italy, Tyrrhenian Sea, Mediterranean.

Jeff Rotman / Red gorgonian coral polyps open {Lophogorgia chilensis} Channel Is, California, USA

Angelo Giampiccolo / Octopus (Octopus vulgaris) and Red Gorgonians (Lophogorgia chilensis) in Italy's Tremiti Islands, off the Adriatic coast.

Alex Mustard / Red gorgonian (Lophogorgia chilensis) grows beneath a forest of Giant kelp (Macrocystis pyrifera), with kelp bass (Paralabrax clathratus). Santa Barbara Island, Channel Islands. Los Angeles, Californi...