California Sheephead Wrasse, Semicossyphus pulcher, San Benito Island, Mexico

Indian steephead parrotfish (Scarus strongycephalus), beak open feeding, Queensland, Australia, Pacific

California Sheephead Wrasse, Semicossyphus pulcher, Cedros Island, Mexico

Twospot Wrasse, Cheilinus bimaculatus, Ambon, Moluccas, Indonesia

Gray reef shark (Carcharhinus amblyrhynchos) approaches reef to get cleaned by wrasse,Truk lagoon, Chuuk, Federated States of Micronesia, Caroline Islands, Micronesia, Pacific Ocean, Pacific

Dotted sweetlips (Plectorhinchus picus), being cleaned by bluestreak cleaner wrasse (Labroides dimidiatus), Namu atoll, Marshall Islands, Pacific

Rainbow wrasses (Thalassoma lucasanum).

Underwater scenes from the lower Gulf of California (Sea of Cortez), Baja California Sur, Mexico. Shown here are rainbow wrasse (Thalassoma lucasanum) feeding on an urchin test.

Underwater scenes from the lower Gulf of California (Sea of Cortez), Baja California Sur, Mexico. Shown here are rainbow wrasse (Thalassoma lucasanum) feeding on an urchin test.

Schooling Humphead wrasse

Underwater scenes from the lower Gulf of California (Sea of Cortez), Baja California Sur, Mexico. Shown here are rainbow wrasse (Thalassoma lucasanum) feeding on an urchin test.

Detail of dorsal fin, parrot fish (Scarus), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Humphead wrasse (Cheilinus undulatus) over coral reef, the Great Barrier Reef, Pacific, Australia, Oceania

Green humphead parrotfish (Bolbometopon muricatum) sleeps at night in shelter, Great Barrier Reef, Unesco World Heritage, Pacific, Australia, Oceania

Detail of tail fin, parrot fish (Scarus), Pacific, Great Barrier Reef, UNESCO World Heritage, Australia, Oceania

Scales of Parrotfish (Scaridae), green, red, Red Sea, Aqaba, Jordan, Asia

Spanish Hogfish or Hog Fish (Bodianus rufus), Roatan, Honduras, Caribbean

Star puffer (Arothron stellatus) and cleaner wrasse (Labroides dimidiatus), open mouth, Indo-Pacific Ocean

Indian humphead parrotfish (Chlorurus strongylocephalus), Indian Ocean, Bali, Indonesia, Asia

Bullethead parrotfish (Chlorurus sordidus), Marsa Shona reef dive site, Egypt, Red Sea, Africa

Striped Parrotfish (Scarus croicensis), Philippines, Asia

Sweetlips (Gaterin orentalis) opens mouth for Bluestreak cleaner wrasse (Labroides dimidiatus), Indian Ocean, Maldives, Asia

Symbiotic behaviour Symbiosis of jewel perch vermillion seabass (Cephalopholis miniata) lies at cleaning stationwith mouth wide open showing teeth rows of teeth motionless in coral reef lets cleaner wrasse bluestreak cleaner wrasse (Labroides dimidiatus) rid itself of parasites, Indian Ocean, Mascarene Islands, Mauritius, Africa

West Indian manatee (Trichechus manatus), overgrown with moss, resting on the bottom, Grass perch, Green sunfish (Lepomis cyanellus) eats moss from manti, cleanerfish, Three Sisters Springs, Manti Sanctuary, Crystal River, Florida, USA, North America

Close-up of giant moray (Gymnothorax javanicus) with cleaner fish, Abu Fendera reef dive site, Egypt, Red Sea, Africa

Humphead wrasse (Cheilinus undulatus), Small Brother dive site, Brother Islands, Egypt, Red Sea, Africa

Symbiotic behaviour Symbiosis of giant moray (Gymnothorax javanicus) with open mouth looks directly at observer lets cleaner wrasse bluestreak cleaner wrasse (Labroides dimidiatus) rid itself of parasites, Indian Ocean, Mascarene Islands, Mauritius, Africa

Humphead wrasse (Cheilinus undulatus), Daedalus reef dive site, Egypt, Red Sea, Africa

Red Sea Dwarf Wrasse (Paracheilinus octotaenia), Dive Site House Reef, Mangrove Bay, El Quesir, Red Sea, Egypt, Africa

Creole Wrasse, Clepticus parrai, Guadeloupe, French West Indies, Caribbean Sea

Creole Wrasse, Clepticus parrai, Dominica, French West Indies, Caribbean Sea

Creole Wrasse, Clepticus parrai, Netherlands Antilles, Bonaire, Caribbean Sea

Noble Pen Shell, Pinna nobilis, Les Ferranelles, Medes Islands, Costa Brava, Mediterranean Sea, Spain

Noble Pen Shell, Pinna nobilis, Les Ferranelles, Medes Islands, Costa Brava, Mediterranean Sea, Spain

Rainbow Wrasse, Coris julis, Istria, Adriatic Sea, Croatia

Bluehead Wrasse, Thalassoma bifasciatum, Netherlands Antilles, Bonaire, Caribbean Sea

Long-snouted Wrasse in Seaweed, Symphodus rostratus, Tamariu, Costa Brava, Mediterranean Sea, Spain

Humpback Wrasse, Cheilinus undulatus, Blue Corner, Micronesia, Palau

Humpback Wrasse, Cheilinus undulatus, Blue Corner, Micronesia, Palau

Humpback Wrasse, Cheilinus undulatus, Blue Corner, Micronesia, Palau

Humpback Wrasse, Cheilinus undulatus, Blue Corner, Micronesia, Palau

Peacock Wrasse, Symphodus tinca, Istria, Adriatic Sea, Croatia

Peacock Wrasse, Symphodus tinca, Istria, Adriatic Sea, Croatia

Twotone wrasses (Thalassoma lunare) and Klein's butterfly fish (Chaetodon kleinii) eating eggs, Komodo National Park, Indian Ocean, Indonesia, Southeast Asia, Asia

Sandager wrasse, Poor Knights Island New Zealand