Alex Mustard / Southern stingray (Dasyatis americana) two swimming over sand bar, under stormy sky. Grand Cayman, Cayman Islands. British West Indies.

Franco Banfi / School of Munk's devil ray, pygmy devil ray, (Mobula munkiana), feeding on plankton at night, photographed on a long exposure, Espiritu Santo Island, Sea of Cortez, Baja California, Mexico, East Pacif...

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school from the air with one leaping out of the water, Baja California, Mexico

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school from the air, Baja California, Mexico.

Jordi Chias / Spotted eagle ray (Aetobatus narinari) school, Kagi kandhu, ;North Male Atoll, Maldives, Indian Ocean.

Jordi Chias / Round ribbontail ray (Taeniura meyeni) South Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Southern stingray (Dasyatis americana) swimming over sand in shallow water, split level photo with blue sky and clouds. The Sandbar, Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Jordi Chias / Giant Manta (Manta birostris) going overhead, Santa Maria Island, Azores, Atlantic Ocean

Jordi Chias / Giant Manta (Manta birostris) with Remoras (Remora brachyptera) attached to both wings, offshore Santa Maria Island, Azores, Atlantic Ocean

Jordi Chias / Mobula / Chilean devil ray (Mobula tarapacana) with remora (Remora brachyptera) and Amberjacks (Serila dumerilli) Santa Maria Island, Azores, Atlantic Ocean

Franco Banfi / Devilrays (Mobula tarapacana) two viewed from below, Ambrosio dive site, Santa Maria Island, Azores, Portugal, Atlantic Ocean.

Franco Banfi / Devilray (Mobula tarapacana) swimming near the surface with remoras, Ambrosio dive site, Santa Maria Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Devilrays (Mobula tarapacana) large group at the surface, Ambrosio dive site, Santa Maria Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Scuba diver with Devilray (Mobula tarapacana), Ambrosio dive site, Santa Maria Island, Azores, Portugal, Atlantic Ocean

Michael Pitts / Giant manta ray (Manta birostris) swimming over a cleaning station, Maldives, Indian Ocean.

Alex Mustard / Large female Southern stingray (Hypanus americanus) in shallow water, under storm clouds, Stingray City, Grand Cayman. Stingray City is feeding site for stingrays and bait was used on this shoot. Caym...

Alex Mustard / Three southern stingrays (Hypanus americanus) under waves. Stingray City, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea. Bait was used for this shot.

Alex Mustard / Southern stingray (Hypanus americanus) at the surface. Stingray City, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea. Bait was used for this shot.

Claudio Contreras / Giant Manta Ray (Manta birostris) at cleaning station with Clarion Angelfish (Holacanthus clarionensis) San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (The Socorro Islands), Pacific...

Claudio Contreras / Giant Manta Ray (Manta birostris), San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve (Socorro Islands), Pacific Ocean, Western Mexico. Vulnerable species.

Michael Pitts / Devil rays (Mobula japonica) viewed from below, South Ari atoll, Maldives.

Franco Banfi / Manta ray (Manta birostris), San Benedicto, Revillagigedo (Socorro) Islands, Mexico, East Pacific Ocean

Franco Banfi / Scuba diver and Manta ray (Manta birostris), San Benedicto, Revillagigedo (Socorro) Islands, Mexico, East Pacific Ocean. Model released.

Alex Mustard / Reef manta (Mobula alfredi) visiting a cleaning station on a coral reef with a school of Onespot snappers (Lutjanus monostigma), Oriental sweetlips (Plectorhinchus vittatus) and Sabre squirrelfish (Sa...

Alex Mustard / Southern stingrays (Dasyatis americana) in shallow water. with sun rays. Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Alex Mustard / A split level photo of a female southern stingray (Dasyatis americana) swimming over seabed. Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Alex Mustard / Southern stingray (Dasyatis americana) female swimming over seabed. Grand Cayman, Cayman Islands. British West Indies. Caribbean Sea.

Shane Gross / Southern stingray (Dasyatis americana) female covering itself with sand to hide. Nassau, Bahamas.

Shane Gross / Eagle ray (Aetobatus narinari), ventral view. Bahamas.

Shane Gross / Eagle ray (Aetobatus narinari) swimming over coral reef, Bahamas.

Shane Gross / Eagle ray (Aetobatus narinari) shoal over coral reef. Bahamas.

Tui De Roy / Reef manta ray (Manta alfredi) shoal filter feeding on plankton concentrated by monsoon currents in Raa Atoll, Vandhoo Thila, Maldives. October.

Alex Mustard / Box ray (Mobula tarapacana) swimming above USS Kittiwake shipwreck. Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Felis Images / Rays (Mobulidae) caught as by-catch, in basket. For sale at Negombo Fish Market, Sri Lanka. 2017. Photo Vydhehi Kadur/Felis Images

Shane Gross / Bluespotted stingrays (Neotrygon kuhlii), near Bali, Indonesia.

Pascal Kobeh / Common eagle ray (Myliobatis aquila) has just been searching in the sand for a prey, Canary Islands

Pascal Kobeh / Common eagle ray (Myliobatis aquila) searching in the sand for a prey with a pearly razorfish / cleaver wrasse (Xyrichtys novacula). On the right, we can make out a flounder laying on the sand and bro...

Pascal Kobeh / Round stingray (Taeniura grabata) laying on the sand and hiding in a cave, Canary Islands

Pascal Kobeh / Common eagle ray (Myliobatis aquila) searching in the sand for a prey, Canary Islands

Pascal Kobeh / Common eagle ray (Myliobatis aquila) searching in the sand for a prey, Canary Islands

Franco Banfi / Diamond stingray (Dasyatis brevis) with Longspined porcupinefish (Diodon holocanthus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Alex Mustard / Reef manta (Mobula alfredi) female swimming close to a coral reef, while cleaner wrasse (Labroides dimidiatus), tiny by comparison, pick parasites from her lips. Misool, Raja Ampat, West Papua, Indone...

Alex Mustard / Portrait of a large female Reef manta ray (Mobula alfredi) swimming over a coral reef. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Alex Mustard / Pair of large reef manta rays (Mobula alfredi) swim over a coral reef cleaning station. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Shane Gross / Southern stingray (Dasyatis americana) feeding in soft sand while a bar jack (Caranx ruber) waits to eat scraps. Eleuthera, Bahamas.

Shane Gross / White spotted eagle ray (Aetobatus narinari) swimming over a Seagrass meadow, off Eleuthera, Bahamas.

Shane Gross / Southern stingray (Dasyatis americana) resting in the sand between corals. Eleuthera, Bahamas.

Pascal Kobeh / Sicklefin devil ray / Chilean devil ray (Mobula tarapacana) with two shark suckers (Remora remora) Azores, Atlantic Ocean.

Pascal Kobeh / Common eagle ray (Myliobatis aquila) Azores, Atlantic Ocean.

Pascal Kobeh / Common eagle ray (Myliobatis aquila) Azores, Atlantic Ocean.

Pascal Kobeh / Common eagle ray (Myliobatis aquila) Azores, Atlantic Ocean.

Pascal Kobeh / Sicklefin devil ray or Chilean devil ray (Mobula tarapacana) with two shark suckers (Remora remora) Azores, Atlantic Ocean.

Pascal Kobeh / Sicklefin devil ray or Chilean devil ray (Mobula tarapacana) with two shark suckers (Remora remora) Azores, Atlantic Ocean.

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school, with some leaping into the air. Aerial view. Baja California, Mexico

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school from the air with one leaping out of the water, Baja California, Mexico

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school from the air, Baja California, Mexico

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school next to boat aerial view. Baja California, Mexico

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school next to boat aerial view. Baja California, Mexico

Mark Carwardine / Munk's pygmy devil ray / Munk's mobula (Mobula munkiana) large school from the air, Baja California, Mexico

Mark Carwardine / Spinetail devil rays (Mobula mobular) aerial view, Baja California, Mexico

Mark Carwardine / Spinetail devil rays (Mobula mobular) aerial Baja California, Mexico

Franco Banfi / River stingray (Potamotrygon sp.), Paraguay River, Pantanal, Brazil

Franco Banfi / River stingray (Potamotrygon sp.), Paraguay River, Pantanal, Brazil

Franco Banfi / River stingray (Potamotrygon sp.), Paraguay River, Pantanal, Brazil

David Fleetham / California bat ray (Myliobatis californica) swimming through Giant kelp (Macrocystis pyrifera) forest, many small fish in background. Santa Barbara Island, California, USA.

David Fleetham / Reef manta ray (Manta alfredi) with black colour variation cruising over coral drop off. Fiji.

David Fleetham / Jack (Caranx sp), shoal of juveniles following Southern stingray (Dasyatis americana), searching for prey. Bahamas.

Alex Mustard / Spotted eagle ray (Aetobatus narinari) swimming in the blue next to a coral reef. Ras Mohammed Marine Park, Sinai, Egypt. Red Sea.

Alex Mustard / Manta ray (Mobula birostris) approaching a reef to be cleaned. Cousins Rock, San Salvador Island, Santiago Island, Galapagos National Park, Galapagos Islands. East Pacific Ocean.

Alex Mustard / Oceanic manta (Mobula birostris). Cousins Rock, San Salvador Island, Santiago Island, Galapagos National Park, Galapagos Islands. East Pacific Ocean.

Stephane Granzotto / Whale shark (Rhincodon typus) and Manta ray (Manta birostris) during a sardine run, Yucatan, Mexico.

Claudio Contreras / Crab trap with Cortez Stingray (Urobatis maculatus), Magdalena Bay, Baja California, Mexico, February

Magnus Lundgren / Wild Wonders of China / Eye of a butterfly ray (Gymnura sp) Pak Lap Tsai, Sai Kung, Hong Kong, China.

David Fleetham / Reef manta ray (Manta alfredi) over hard coral off West Maui, Hawaii.

David Fleetham / Manta ray (Manta alfredi) with cleaner wrasse, Manta Reef, Kandavu, Fiji.

David Fleetham / Manta ray (Manta alfredi) with cleaner wrasse, Manta Reef, Kandavu, Fiji.

David Fleetham / Manta ray (Manta birostris) gliding over a cleaning station in M'il Channel, Yap, Micronesia.

Alex Mustard / Reef manta (Mobula alfredi) at a cleaning station with Cleaner wrasse (Labroides dimidiatus). South Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Reef manta (Mobula alfredi) swimming with Remoras (Remora remora). South Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Spotted eagle ray (Aetobatus narinari), female swimming over coral reef. Individual appears heavily pregnant. South Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Spotted eagle ray (Aetobatus narinari) female swimming over coral reef. South Male Atoll, Maldives. Indian Ocean.

Linda Pitkin / Bluespotted ribbontail ray (Taeniura lymma) Jolande Reef, Ras Mohammed National Park, Egypt, Red Sea.

Claudio Contreras / Thorny round stingray (Urotrygon chilensis), Punta Maguey, Huatulco Bays National Park, southern Mexico.

Jordi Chias / Giant manta (Manta birtostris) Ari Atoll, Maldives islands, Indian Ocean

Jordi Chias / Giant manta (Manta birtostris) swimming over the reef, Ari Atoll, Maldives Islands. Indian Ocean

Jordi Chias / Giant manta (Manta birtostris) swimming over a cleaning station, Malet Atoll, Maldives islands.

Jordi Chias / Spotted eagle ray (Aetobatus narinari) Kagi kandhu, North Male Atoll; Indian Ocean, Maldives.

Jordi Chias / Jenkins' whipray (Himantura jenkinsii) Male Atoll; Maldives Islands, Indian ocean

Jordi Chias / Pennant coralfish (Heniochus acuminatus) cleaning Smalleye stingray (Dasyatis microps) Tofo, Mozambique, Indian ocean.

Alex Mustard / Southern stingray (Dasyatis americana) female swimming over a shallow sand bank with ripples. Stingray City Sandbar, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Two large female Southern stingrays (Dasyatis americana) swim over sand in shallow water, split level photo with blue sky and clouds. The Sandbar, Grand Cayman, Cayman Islands. British West Indies. Ca...