
Whitetip reef shark (Triaenodon obesus) circles a pinnacle at Cocosl Island.

Whitetip reef sharks (Triaenodon obesus) hunt small reef fish hiding in the coral at nght. Cocos Island. Costa Rica.

Scalloped hammerhead shark (Sphyrna lewini) school near the surface. These mostly young females are probably seeking refuge during the daytime. Scalloped hammerheads feed at night. Costa Rica.

Marbled ray (Taeniura meyeni) and whitetip reef shark (Triaenodon obesus) at night. Costa Rica.

Whitetip reef sharks (Triaenodon obesus) hunt small reef fish hiding in the coral at nght. Cocos Island.

Rainbow runners (Elagatis bipinnulata) accompany a whitetip reef shark (Triaenodon obesus) at Cocos Island. Costa Rica.

Scalloped hammerhead sharks (Sphyrna lewini) come to cleaning stations during the day to have parasites and loose tissue removed by barberfish (Johnrandallia nigrirostris) and other cleaner fishes. Cocos Island.

Silhouette of scalloped hammerhead shark (Sphyrna lewini) at Cocos Island. Costa Rica.

Ventral view of scalloped hammerhead shark (Sphyrna lewini) at Cocos Island. Costa Rica.

Dozens of starfish cover a sand bed at Cocos Island. Costa Rica.

Filming diver swims through a school of Bigeye trevally (Caranx sexfasciatus). Costa Rica.

Head on shot of yellowtail damselfish (Stegastes arcifrons) at Cocos Island

Cocos wrasse (Halichoeres dicolor) (terminal male) - endemic to Cocos Island. Costa Rica.

Juvenile leatherbass (Dermatolepis dermatolepis). At this stage, leather bass often seek shelter among the long spines of the sea urchin, where their barred pattern serves as camouflage. Costa Rica.

Cocos garden eel (Heteroconger klausewitzi). The common name is deceiving. This species is actually widespread in the Eastern Pacific region. Costa Rica.

Blackfin cardinalfish (Apogon atradorsatus) are found only at Cocos Island, Malpelo Island and Galapagos usually near crevices and sea urchins. Costa Rica.

Juvenile Mexican hogfish (Bodianus diplotaenia). Costa Rica.

Black jack (Caranx lugubris) and whitetip reef shark (Triaenodon obesus) hunt small reef fish hiding in the coral at night. Costa Rica.

Blackfin cardinalfish (Apogon atradorsatus) are found only at Cocos Island, Malpelo Island and Galapagos usually near crevices and sea urchins. Costa Rica.

Bigeye trevally (Caranx sexfasciatus) and Pacific creolefish (Paranthias colonus) schooling up close. Cocos Island. Costa Rica.

Cortez chub (Kyphosus elegans) and Pacific red snapper (Lutjanus peru) feeding at the surface. Cocos Island.

Motion blur of Cortez chub (Kyphosus elegans) and Pacific red snapper (Lutjanus peru) feeding at the surface. Cocos Island.

Cocos serranus (Serranus tico), a Cocos Island endemic. Costa Rica.

Two orange commerson's frogfish (Antennarius commerson) at Cocos Island. Costa Rica.

Marbled ray (taeniura meyeni) and fish reef scene at Cocos Island. Costa Rica.

School of leather bass (Dermatolepis dermatolepis) at Cocos Island. Costa Rica.

Schooling mullet snapper (Lutjanus aratus). Costa Rica.

Scalloped hammerhead sharks (Sphyrna lewini) come to cleaning stations during the day to have parasites and loose tissue removed by barberfish (Johnrandallia nigrirostris) and other cleaner fishes. Cocos Island.

Scalloped hammerhead sharks (Sphyrna lewini) come to cleaning stations during the day to have parasites and loose tissue removed by barberfish (Johnrandallia nigrirostris) and other cleaner fishes. Cocos Island. Costa Rica.

Leather bass (Dermatolepis dermatolepis) sub-adult phase. Costa Rica.

School of bigeye trevally (Caranx sexfasciatus). Cocos Island. Costa Rica.

School of yellowtail surgeonfish (Prionurus punctatus). Cocos Island. Costa Rica.

Coral bleaching occurs when coral polyps expel algae that live inside their tissues due to adverse environmental conditions, most often abnormally warm water temperatures. Not even the remote coral reefs of Cocos Island are immune to climate change. Costa Rica.

Coral bleaching occurs when coral polyps expel algae that live inside their tissues due to adverse environmental conditions, most often abnormally warm water temperatures. Not even the remote coral reefs of Cocos Island are immune to climate change. Costa Rica.

Cocos Island landscape, Chatham Bay, aerial view. Costa Rica.

Flying brown booby under white sky. Costa Rica.

Red-footed boobys. Cocos Island. Costa Rica.

Two red-footed boobys. Cocos Island. Costa Rica.