Sergio Hanquet / Wide-eyed flounder (Bothus podas) portrait showing eyes above head, Tenerife, Canary Islands.

Solvin Zankl / Flatfish (Bothidae sp) larva, Atlantic Ocean off Cape Verde. Captive.

Magnus Lundgren / Wild Wonders of China / Peacock flounder (Bothus mancus), Green Island, Taiwan.

Magnus Lundgren / Wild Wonders of China / The peacock flounder (Bothus mancus), Green Island, Taiwan.

Magnus Lundgren / Wild Wonders of China / Peacock flounder (Bothus mancus), Green Island, Taiwan.

Shane Gross / Peacock flounder (Bothus lunatus) settling at night. The Bahamas.

Alex Mustard / Courtship between a pair of Eyed flounder (Bothus ocellatus). West Bay, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Magnus Lundgren / Many-spotted lefteye flounder (Arnoglossus polyspilus) larval juvenile, transparent and pelagic, Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean. Magnus

Pascal Kobeh / Peacock flounder (Bothus mancus) lying on the sandy seabed, Revillagigedo islands, Mexico. Pacific Ocean.

Magnus Lundgren / Many-spotted lefteye flounder (Arnoglossus polyspilus) Balayan Bay, Luzon Island, Philippines Magnus

Magnus Lundgren / Larval three-spot flounder, or many-eyed flounder (Grammatobothus polyophthalmus) Balayan Bay, Luzon Island, Philippines Magnus

Magnus Lundgren / Juvenile lefteye flounder (Bothidae sp.) photographed at night, Balayan Bay, Luzon, Philippines. Magnus

Pascal Kobeh / Close-up of Peacock flounder (Bothus mancus), Sulu sea, Philippines

Pascal Kobeh / Wide-eyed flounder (Bothus podas) on the sandy bottom, Canary Islands

Pascal Kobeh / Wide-eyed flounder (Bothus podas) on the sandy bottom, Canary Islands

Pascal Kobeh / Wide-eyed flounder (Bothus podas) on a sandy bottom, Azores, Atlantic ocean.

Georgette Douwma / Leopard flounder fish (Bothus pantherinus) camouflaged on sand. North Sulawesi, Indonesia.

Linda Pitkin / Peacock flounder (Bothus lunatus), camouflaged on sandy sea bed Bonaire, Leeward Antilles, Caribbean.

Doug Perrine / Left-eyed flounder (Engyprosopon xenandrus) larva, photographed at night in surface waters of deep ocean off Kailua Kona, Hawaii, USA.

Claudio Contreras / Tropical flounder (Bothus mancus) and Chinese trumpetfish (Aulostomus chinensis), Socorro Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico, March

David Fleetham / Divers and Peacock flounder (Bothus mancus) off the Island of Lanai, Hawaii. December 2013.

Claudio Contreras / Tropical Flounder (Bothus mancus), Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, West...

Claudio Contreras / Tropical Flounder (Bothus mancus), Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, West...

Claudio Contreras / Tropical Flounder (Bothus mancus), Socorro Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Pacific Ocean, West...

Claudio Contreras / Tropical Flounder (Bothus mancus) swimming, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Paci...

Georgette Douwma / Leopard flounder fish (Bothus pantherinus). Lembeh Strait, North Sulawesi, Indonesia.

Roland Seitre / Leopard flounder (Bothus pantherinus) camouflaged in sand, House Reef, El Quseir, Egypt.

Georgette Douwma / Peacock flounder (Bothus lunatus) just visible on seabed. Lembeh, Sulawesi, Indonesia.

Solvin Zankl / Deep sea hatchetfish (Sternoptyx diaphana) profile. Deep sea species from Atlantic Ocean close to Cape Verde. Captive.

Solvin Zankl / Flatfish (Bothidae sp) larva with upright swimming and bilaterally symmetric bodies. When the larva develops to an adult asymmetric vertebrat, the right eye migrates from the right side of the body to...

Solvin Zankl / Flatfish (Bothidae sp) larva with upright swimming and bilaterally symmetric bodies. When the larva develops the right eye migrates from the right side of the body to the left where it 'joins' the lef...

Constantinos Petrinos / Wide-eyed flounder (Bothus podas) perfectly camouflaged against the sandy substrate. Athens, Attica Region, Greece. Saronic Gulf, Aegean Sea. August.

Pascal Kobeh / Wide-eyed flounder (Bothus podas) male on sandy sea floor, Gozo Island, Malta. Mediterranean Sea.

Pascal Kobeh / Wide-eyed flounder (Bothus podas) male on sandy sea floor, Gozo Island, Malta. Mediterranean Sea.

Pascal Kobeh / Wide-eyed flounder (Bothus podas) female on sandy sea floor, Gozo Island, Malta. Mediterranean Sea.

Pascal Kobeh / Peacock flounder (Bothus mancus) resting on coral reef, Maldives. Indian Ocean.

Jeff Rotman / Peacock flounder (Bothus lunatus) on the sea floor of Lembeh Strait, Celebes Sea, Sulawesi, Indonesia.

Birgitte Wilms / Lefteye Flounder (Bothus sp) portrait, camouflaged against sandy ocean floor, 60 feet deep, Solomon Islands

Chris Newbert / Lefteye Flounder (Bothus sp) eyes peering from sand, 20 feet deep, Solomon Islands

Chris Newbert / Larval Flounder of unknown species is translucent when young, Hawaii

Luciano Candisani / Flowery Flounder (Bothus mancus) camouflaged in sand, Rocas Atoll, Brazil

Luciano Candisani / Flowery Flounder (Bothus mancus) camouflaged against ocean floor, Rocas Atoll, Brazil

Luciano Candisani / Flowery Flounder (Bothus mancus) portrait showing both eyes on the same side of the head, Rocas Atoll, Brazil

Ingo Arndt / European Flounder (Platichthys flesus) eyes, fish is approximately nine centimeters, Helgoland, Germany

Ingo Arndt / European Flounder (Platichthys flesus) approximately nine centimeters, Helgoland, Germany

Ingo Arndt / European Flounder (Platichthys flesus) approximately nine centimeters, Helgoland, Germany

Gary Bell/ Oceanwide / Leopard Flounder (Bothus pantherinus) camouflaged on ocean floor, Anilao, Philippines

Norbert Wu / Leopard Flounder (Bothus pantherinus) camouflaged on ocean floor, Ambon, Indonesia