Jeff Rotman / Eye of a Peacock grouper (Cephalopholis argus) Red Sea, Egypt.

Juergen Freund / Coral trout / Leopard coral grouper (Plectropomus leopardus) mating behaviour. Males approach the females and display with their bodies and fins. Misool, Raja Ampat, West Papua, Indonesia,

Jeff Rotman / Close-up of the eye of a Jewel Grouper / Coral hind (Cephalopholis Miniata) Red Sea, Egypt

Jeff Rotman / Jewel Grouper / Coral hind (Cephalopholis Miniata) with mouth open, Red Sea, Egypt

Norbert Wu / Coral Grouper (Cephalopholis miniata) changes color to match surroundings and mood, Red Sea, Egypt

Fred Bavendam / Coral Grouper (Cephalopholis miniata), Andaman Sea, Thailand

Norbert Wu / Coral Grouper (Cephalopholis miniata) a type of grouper, changes color at will, Great Barrier Reef, Australia

Alex Mustard / Detailed photo of the eye and pattern of a Coney (Epinephelus fulvus). George Town, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Sergio Hanquet / Canary fish (Epinephelus marginatus) resting on sea floor. El Hierro, Canary Islands.

Shane Gross / Spotted scorpionfish (Scorpaena plumieri) camouflaged on a sponge, The Bahamas.

David Fleetham / Stone scorpionfish (Scorpaena plumieri mystes) camouflaged against surrounding reef. Galapagos Islands National Park, Isabela Island, Ecuador.

Richard Robinson / Greasy grouper (Epinephelus tauvina) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Alex Mustard / Sixbar grouper (Cephalopholis sexmaculata) in overhang on a coral reef. South Ari Atoll, Maldives. Indian Ocean.

Linda Pitkin / Spotted scorpionfish (Scorpaena plumieri) Bonaire, Leeward Antilles, Caribbean.

Linda Pitkin / Spotted scorpionfish (Scorpaena plumieri), camouflaged on coral reef Bonaire, Leeward Antilles, Caribbean.

Alex Mustard / Shoal of a Red Sea soldierfish (Myripristis murdjan) and Sixbar grouper (Cephalopholis sexmaculata) shelter in a coral filled cave. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Bert Willaert / Closeup of a Orange-spotted grouper (Epinephelus coioides), Kimbe Bay, West New Britain, Papua New Guinea

Alex Mustard / Slender grouper (Anyperodon leucogrammicus) exploiting the confusion caused by and Orange spotted trevally (Carangoides bajad) hunting silversides (Atherinidae) to plan an ambush. Raja Ampat, West Pap...

Pete Oxford / Spotted scorpionfish (Scorpaena plumieri) Lighthouse Reef Atoll, Belize.

Pete Oxford / Honeycomb grouper (Epinephelus merra) Rainbow Reef, Fiji, South Pacific.

Pete Oxford / Honeycomb grouper (Epinephelus merra) Rainbow Reef, Fiji, South Pacific.

Pascal Kobeh / Saddle grouper / Sixspot rockcod (Cephalopholis sexmaculata) with White-edged soldierfish (Myripristis murdjan) in a cave, Maldives. Indian Ocean.

Jeff Rotman / Lunartail grouper / Yellow-edged lyretail (Variola louti) mouth, Red Sea, Egypt.

Michael Pitts / Orange-striped triggerfish (Balistapus undulatus) and Sixspot groupers (Cephalopholis sexmaculata) on a sunken shipwreck, Maldives, Indian Ocean.

Alex Mustard / Large male Coral grouper (Cephalopholis miniata) in front of school of glassfish. Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Alex Mustard / Portrait of cave dwelling Saddled grouper (Cephalopholis sexmaculata) in Ras Mohammed Marine Park. Sinai, Egypt. Red Sea.

Jeff Rotman / Jewel grouper (Cephalopholis miniata) portrait, Red Sea, Egypt

Nick Garbutt / Immature Areolate Grouper or Rock Cod (Epinephelus areolatus) on sale in fish souk (market) in Sharjah, United Arab Emirates. April 2013

Claudio Contreras / Flag cabrilla (Epinephelus labriformis), Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

Juergen Freund / Tomato grouper (Cephalopholis sonnerati) portrait, Bali, Indonesia.

Juergen Freund / Coral trout / Leopard coral grouper (Plectropomus leopardus) in the reef. Misool, Raja Ampat, West Papua, Indonesia, January.

Juergen Freund / Coral trout / Leopard coral grouper (Plectropomus leopardus) mating behaviour. Males approach the females and display with their bodies and fins. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Juvenile Barramundi cod / Panther grouper (Chromileptes altivelis) in the reef. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Pair of Coral trout / Leopard coral groupers (Plectropomus leopardus) performing mating behaviour. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Coral trout / Leopard coral grouper (Plectropomus leopardus). Misool, Raja Ampat, West Papua, Indonesia, January

Tim Laman / Blue-spotted / Peacock Groupers and other fish, in reef of soft and hard corals. Vicinity of Gam Island, Raja Ampat Islands, Indonesia. May 2007

Tim Laman / Blue-spotted grouper (Cephalopholis miniata), soft corals and feather stars at the Liberty shipwreck, Tulamben, Bali Island, Indonesia, May 2006

Jeff Rotman / Close-up of the scales of a Jewel Grouper / Coral hind (Cephalopholis Miniata) Red Sea, Egypt

Fred Bavendam / Leopard Grouper (Plectropomus leopardus) showing teeth, Great Barrier Reef, Australia

Fred Bavendam / Coral Grouper (Cephalopholis miniata), Thailand

GEORGETTE DOUWMA / Longfin grouper (Epinephelus quoyanus) Andaman Sea, Myanmar / Burma, Indian ocean

Doug Perrine / Coral hind grouper {Cephalopholis miniata} Similan Is, Thailand

Chris Newbert / Grouper (Cephalopholis sp) and Red Sea Bannerfish (Heniochus intermedius), Red Sea, Egypt

Chris Newbert / Grouper (Cephalopholis sp) and Soft Coral (Dendronephthya sp) 70 feet deep, Solomon Islands

Chris Newbert / Half-spotted Grouper (Cephalopholis hemistiktos) pectoral fin detail, Red Sea, Egypt

Norbert Wu / Potato Cod (Epinephelus tukula), Burma Banks, Myanmar

Fred Bavendam / Coral Grouper (Cephalopholis miniata), Loloata Resort, Papua New Guinea

Fred Bavendam / Leopard Grouper (Plectropomus leopardus) portrait, Great Barrier Reef, Queensland, Australia

Fred Bavendam / Coral Grouper (Cephalopholis miniata) exhibiting an unusual pale coloration pattern at dusk, Bali, Indonesia

Michael Pitts / Brown spotted grouper inside wreck {Epinephelus chlorostigma} Solomon Is, Pacific japanese

GEORGETTE DOUWMA / Coral hind fish portrait {Cephalopholis miniata} Red Sea

Brent Hedges / Royal coral /Spotted grouper {Plectropomus p marisurbri} Papua New Guinea

David Hall / RF - Coral reef scene with Gorgonian sea fan (Melithaea sp.), Feather stars (Crinoidea), Saddle grouper (Cephalopholis sexmaculata) and Blacklip butterflyfish (Chaetodon kleinii). Also present are se...

David Hall / Humpback grouper (Cromileptes altivelis) juvenile, portrait, Raja Ampat, Indonesia, Pacific Ocean.

Joel Sartore / Photo Ark / Orange-spotted grouper (Epinephelus coioides) portrait, Sharjah Aquarium, UAE. Captive, occurs in Indo-Pacific.

Joel Sartore / Photo Ark / Orange-spotted grouper (Epinephelus coioides) head portrait, Sharjah Aquarium, UAE. Captive, occurs in Indo-Pacific.

Joel Sartore / Photo Ark / Epaulet grouper (Epinephelus stoliczkae) head portrait, Sharjah Aquarium, UAE. Captive.

Joel Sartore / Photo Ark / Epaulet grouper (Epinephelus stoliczkae) portrait, Sharjah Aquarium, UAE. Captive.

Joel Sartore / Photo Ark / Snowy grouper (Hyporthodus niveatus) head portrait, Indianapolis Zoo, Indiana. Captive, occurs in western Atlantic Ocean.

Joel Sartore / Photo Ark / Coral hind (Cephalopholis miniata) head portrait, Oklahoma Aquarium. Captive, occurs in Indo-Pacific.

Joel Sartore / Photo Ark / Coral hind (Cephalopholis miniata) portrait, Oklahoma Aquarium. Captive, occurs in Indo-Pacific.

Joel Sartore / Photo Ark / Coral hind (Cephalopholis miniata) head portrait, Oklahoma Aquarium. Captive, occurs in Indo-Pacific.

Franco Banfi / Coral grouper (Cephalopholis miniata), Lyretail anthias (Pseudanthias squamipinnis) and other reef fish swimming through Black sun coral (Tubastraea micrantha) and soft coral on coral reef, Maahia Thi...

Alex Mustard / Peacock grouper (Cephalopholis argus) with fishing line caught in its mouth, Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Alex Mustard / Coral grouper (Cephalopholis miniata), most likely a male, on a coral reef, portrait, Ras Mohammed National Park, Sinai, Egypt, Red Sea.

Alex Mustard / Barramundi grouper (Cromileptes altivelis) swimming in front of an orange Seafan (Annella sp.), Raja Ampat, West Papua, Ceram Sea, Pacific Ocean.

Joel Sartore / Photo Ark / Close up of a Coral grouper (Cephalopholis miniata) head. The animal looks around. Oklahoma Aquarium. Captive.

David Fleetham / Cleaner shrimp (Urocaridella antonbruunii) looking for parasites on a Coral grouper (Cephalopholis miniata), Yap, Micronesia, Pacific Ocean.

Franco Banfi / Starry grouper (Epinephelus labriformis) resting on rock ledge watching shoal of Sardines (Sardina sp.), Espiritu Santo Island, Baja California, Mexico, Sea of Cortez.

Fred Bavendam / Day octopus (Octopus cyanea) spreading its arms and webbing over rock to trap prey, with Blue-spotted peacock grouper (Cephalopholis argus) and Goldsaddle goatfish (Parupeneus cyclostomus) watching fo...

Joel Sartore / Photo Ark / Snowy grouper (Hyporthodus niveatus) portrait, Indianapolis Zoo. Captive, occurs in Western Atlantic Ocean.

Joel Sartore / Photo Ark / Snowy grouper (Hyporthodus niveatus) portrait, Indianapolis Zoo. Captive, occurs in Western Atlantic Ocean..

David Fleetham / Malabar grouper (Epinephelus malabaricus) swimming reef, Fiji, Pacific Ocean.

David Fleetham / Peacock grouper (Cephalopholis argus) and two Whitemouth moray eels (Gymnothorax meleagris) collaborative hunting, Hawaii, Pacific Ocean.

Doug Perrine / Hunting coalition of Blue goatfish / Yellowsaddle goatfish (Parupeneus cyclostomus), Peacock grouper (Cephalopholis argus) and Day octopus (Octopus cyanea), Makako Bay, Kona, Hawaii, Pacific Ocean.

Magnus Lundgren / Roving coral grouper (Plectropomus pessuliferus) eye detail, Raja Ampat, West Papua, Indonesia, Pacific Ocean.

David Fleetham / Peacock grouper (Cephalopholis argus) swimming in midwater above the reef, Maui, Hawaii, Pacific Ocean.

Henley Spiers / Spotted scorpionfish (Scorpaena plumieri) resting on seabed surrounded by seagrass, Saint Lucia, Caribbean Sea.

David Fleetham / A Peacock hind (Cephalopholis argus), an alien species, swimming through a coral reef, Maui, Hawaii, USA.

David Fleetham / Spotted scorpionfish (Scorpaena plumieri) one of the largest and most common of the scorpionfishes in the Atlantic and Caribbean. Camouflaged against background on sea floor, off Singer Island, Atlant...

Alex Mustard / Portrait of a Coral grouper (Cephalopholis miniata) on a reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

David Fleetham / Yellow margin moray eel (Gymnothorax flavimarginatus) with two Blue goatfish (Parupeneus cyclostomus), a Bluefin trevally (Caranx melampygus) and a Peacock grouper (Cephalopholis argus) hunting co-ope...

Doug Perrine / Hunting coalition of Peacock groupers (Cephalopholis argus) and Whitemouth moray eel, (Gymnothorax meleagris) Honokohau, North Kona, Big Island, Hawaii, USA

Doug Perrine / Hunting coalition of a Peacock grouper (Cephalopholis argus) and a whitemouth moray eel (Gymnothorax meleagris) Honokohau, North Kona, Big Island, Hawaii. The grouper is waiting for the eel to go hunt...

Doug Perrine / Hunting coalition of Peacock grouper, (Cephalopholis argus) and Whitemouth moray eel, (Gymnothorax meleagris) Kohanaiki, North Kona, Big Island, Hawaii. The eel hunts inside the reef crevices while th...

Pascal Kobeh / Graysby (Cephalopholis cruentata) fish hiding in reef. Bahamas.

Alex Mustard / Diver swimming over a coral reef with Staghorn coral (Acropora cervicornis) with Blue chromis (Chromis cyanea) and Spotted scorpionfish (Scorpaena plumieri). East End, Grand Cayman, Cayman Islands, Br...

Willem Kolvoort / Potato grouper (Epinephelus tukala) in Passe Dubois / Dubois channel, Aldabra, Indian Ocean

Willem Kolvoort / Potato groupers (Epinephelus tukala) in Passe Dubois / Dubois channel, Aldabra, Indian Ocean

Georgette Douwma / Areolate grouper (Epinephelus areolatus). Tulamben, Bali, Indonesia.

Georgette Douwma / Highfin grouper (Epinephelus maculatus). Tulamben, Bali, Indonesia.