Nuno Sa / Manta Ray (Manta Birostris) and Devil Ray (Mobula tarapacana) in background, accompanied by Pilot Fish (Naucrates ductor) and Remora. Santa Maria Island, Azores, September.

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.

Franco Banfi / Giant manta ray (Manta birostris) and two Devilrays (Mobula tarapacana), Formigas Islet dive site, Azores, Atlantic Ocean

Nuno Sa / Manta Ray (Manta Birostris) and Devil Ray (Mobula tarapacana) in background, accompanied by Remora. Santa Maria Island, Azores, September.

David Hall / Giant oceanic manta ray (Mobula birostris) somersaulting while feeding on plankton, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered.

David Hall / Giant oceanic manta ray (Mobula birostris) somersaulting while feeding on plankton, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered.

David Hall / Giant oceanic manta ray (Mobula birostris) with two Remoras (Remora remora) attached, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered.

David Hall / Giant oceanic manta ray (Mobula birostris) swimming over volcanic rock with two Remoras (Remora sp.) attached in front and a Clarion angelfish "cleaner" (Holacanthus clarionensis) following behind, So...

David Hall / Giant oceanic manta ray (Mobula birostris) with two Remoras (Remora sp.) swimming underneath, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered.

David Hall / Giant oceanic manta ray (Mobula birostris) with two Remoras (Remora sp.) attached underneath, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered.

David Hall / Giant oceanic manta ray (Mobula birostris) being followed by two Remoras (Remora sp.) and a group of Clarion angelfish (Holacanthus clarionensis), Revillagigedo Islands, Mexico, Pacific Ocean. Endange...

David Hall / Giant oceanic manta ray (Mobula birostris) with two Remoras (Remora sp.) and shoal of Black jacks (Caranx lugubris) swimming alongside, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangere...

David Hall / Giant oceanic manta ray (Mobula birostiris) with a Remora (Remora sp.) and two Black jacks (Caranx lugubris) swimming beneath it, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered.

David Hall / RF - Giant oceanic manta ray (Mobula birostris) portrait, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered. (This image may be licensed either as rights managed or royalty free.)

David Hall / RF - Giant oceanic manta ray (Mobula birostris) with two Remoras (Remora sp.) attached swimming over volcanic rock, Socorro, Revillagigedo Islands, Mexico, Pacific Ocean. Endangered. (This image may b...

Tom Vierus / Drone shot of Oceanic manta ray (Mobula birostris) swimming at water's surface, Laucala Bay, Suva, Fiji, Pacific Ocean, July. Critically endangered.

Tom Vierus / Drone shot of Oceanic manta ray (Mobula birostris) feeding at water's surface beside recreational boat, Laucala Bay, Suva, Fiji, July. Critically endangered.

Tom Vierus / Aerial shot of Oceanic manta ray (Mobula birostris) feeding at water's surface, Laucala Bay, Suva, Fiji, July. Critically endangered.

Tom Vierus / Drone shot of Oceanic manta ray (Mobula birostris) barrel feeding at water's surface, Laucala Bay, Suva, Fiji, Pacific Ocean, May. Critically Endangered.

Tom Vierus / Drone shot of Oceanic manta ray (Mobula birostris) swimming at water's surface, Laucala Bay, Suva, Fiji, Pacific Ocean, May. Critically endangered.

Tom Vierus / Drone shot of Oceanic manta ray (Mobula birostris) breaching and landing on back, Laucala Bay, Suva, Fiji, Pacific Ocean, May, Critically endangered.

Tom Vierus / Drone shot of Oceanic manta ray (Mobula birostris) resting beneath water surface, Laucala Bay, Suva, Fiji, Pacific Ocean, May. Critically endangered.

Lucas Bustamante / Giant manta ray / Oceanic manta ray (Mobula birostris) with two Remoras (Remora sp.) swimming on dorsal side, Isla de la Plata, Manabi, Ecuador, Pacific Ocean. Endangered.

Lucas Bustamante / Giant manta ray / Oceanic manta ray (Mobula birostris) with Blacknosed butterflyfish (Johnrandallia nigrirostris) school following, Isla de la Plata, Manabi, Ecuador, Pacific Ocean. Endangered.

Lucas Bustamante / Giant manta ray / Oceanic manta ray (Mobula birostris) with Blacknosed butterflyfish (Johnrandallia nigrirostris) school following, Isla de la Plata, Manabi, Ecuador, Pacific Ocean. Endangered.

Lucas Bustamante / Giant manta ray / Oceanic manta ray (Mobula birostris) with two Remoras (Remora sp.) swimming on dorsal side, Isla de la Plata, Manabi, Ecuador, Pacific Ocean. Endangered.

Alex Mustard / Oceanic manta ray (Mobula birostris) accompanied by three Black jacks (Caranx lugubris) silhouetted, Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Oceanic manta ray (Mobula birostris) being cleaned by three Clarion angelfish (Holacanthus clarionensis), Socorro Island, Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Oceanic manta ray (Mobula birostris) with cephalic fins curled as classic devil ray horns, accompanied by two Remoras (Remora remora), Revillagigedo Islands, Mexico, Pacific Ocean

Alex Mustard / Clarion angelfish (Holacanthus clarionensis) cleaning the skin of an Oceanic manta ray (Mobula birostris), Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Group of Clarion angelfish (Holacanthus clarionensis) cleaning an Oceanic manta ray (Mobula birostris) as it swims over the reef, Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Oceanic manta ray (Mobula birostris) rolling over on its back as it is cleaned by Clarion angelfish (Holacanthus clarionensis), Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Two Oceanic manta rays (Mobula birostris) waiting to be cleaned by Clarion angelfish (Holacanthus clarionensis), Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Oceanic manta ray (Mobula birostris) with cephalic fins curled as classic devil ray horns, Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Oceanic manta ray (Mobula birostris) male, caught in sunlight swimming close to surface, Revillagigedo Islands, Mexico, Pacific Ocean.

Alex Mustard / Oceanic manta ray (Mobula birostris) silhouetted, swimming near the surface, Revillagigedo Islands, Mexico, Pacific Ocean.

Tony Wu / Oceanic manta ray (Mobula birostris) swimming along the ocean surface skimming for food, with both wings in the up position, Sri Lanka, Indian Ocean.

Tony Wu / Oceanic manta ray (Mobula birostris) swimming along the ocean surface skimming for food, with both wings in the up position, Sri Lanka, Indian Ocean.

Tony Wu / Oceanic manta ray (Mobula birostris) swimming along the ocean surface skimming for food, with both wings in the down position, Sri Lanka, Indian Ocean.

Tony Wu / Oceanic manta ray (Mobula birostris) swimming along the ocean surface skimming for food, Sri Lanka, Indian Ocean.

Tony Wu / Oceanic manta ray (Mobula birostris) swimming along the ocean surface, Sri Lanka, Indian Ocean.

Noemie Stroh / Giant oceaninc manta ray (Mobula birostris) female swimming, Socorro, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Giant oceaninc manta ray (Mobula birostris) female swimming, Roca partida, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Giant oceaninc manta ray (Mobula birostris) female swimming, followed by male, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Giant oceaninc manta ray (Mobula birostris) swimming, San Benedicto, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Bottlenose dolphin (Tursiops truncatus) pod swimming alongside Giant oceanic manta ray (Mobula birostris), San Benedicto, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Giant oceanic manta ray (Mobula birostris) male swimming over reef, Cabo Pierce, Revillagigedo Islands, Mexico, December.

Noemie Stroh / Black giant oceanic manta ray (Mobula birostris) being cleaned by Clarion angelfish (Holacanthus clarionensis), with Remora fish attached, Revillagigedo Islands, Mexico, December.

Pascal Kobeh / Divers with Giant mantray (Mobula birostris) swimming in the open water and surrounded with black jacks or trevally (Caranx lugubris), Revillagigedo islands, Mexico. Pacific Ocean.

Pascal Kobeh / Diver with Giant mantray (Mobula birostris) swimming in the open water with Remora (Remora remora) hung on its body and surrounded with Black jacks or trevally (Caranx lugubris), Revillagigedo islands...

Pascal Kobeh / Giant mantray (Mobula birostris ) swimming in the open water, Revillagigedo islands, Mexico. Pacific Ocean.