Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands, Egy...

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with Pilot Fish (Naucrates ductor), Bahamas, Caribbean

Michael Pitts / Oceanic whitetip shark {Carcharhinus longimanus} and Pilotfish {Naucrates ductor} Red Sea.

Michael Pitts / Oceanic whitetip shark {Carcharhinus longimanus} + Pilotfish {Naucrates ductor} Red Sea.

Michael Pitts / Oceanic whitetip shark {Carcharhinus longimanus} + Pilotfish {Naucrates ductor} Red Sea.

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.

Alex Mustard / Whitetip shark (Carcharhinus longimanus), accompanied by Pilotfish (Naucrates ductor), swims towards the camera as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Br...

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) is accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands N...

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) cruising through water,. This individual is accompanied by a group of Pilotfish (Naucrates ductor), mostly out of frame. Little Brother Island, Egypt....

Sebastian Kennerknecht / Pilot, Mark Dedon, getting ready for take-off, Santa Cruz Puma Project, Livermore, California

Tony Wu / Sperm whale (Physeter macrocephalus) juvenile with Pilotfish (Naucrates ductor) near surface, Caribbean.

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by a group of Pilotfish (Naucrates ductor). Rocky Island, Egypt. Red Sea

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by a group of Pilotfish (Naucrates ductor). Rocky Island, Egypt. Red Sea

Sebastian Kennerknecht / Mountain Lion (Puma concolor) biologist, Paul Houghtaling, and pilot Mark Dedon, tracking mountain lions from airplane using telemetry, Santa Cruz Puma Project, Santa Cruz Mountains, California

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea in the late afternoon, close to Little Brother Island. The...

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. A rainbow runner (Elagati...

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands, Egy...

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with Pilot Fish (Naucrates ductor), Bahamas, Caribbean

Mike Parry / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Mike Parry / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Hiroya Minakuchi / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) pair with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Norbert Wu / Deep flight submersible piloted by creator Graeme Hawke, Monterey, California

Flip Nicklin / Whale Shark (Rhincodon typus) swimming underwater with symbiotic Pilot Fish (Naucrates ductor), Baja California, Mexico

Flip Nicklin / Whale Shark (Rhincodon typus) swimming underwater with symbiotic Pilot Fish (Naucrates ductor), Baja California, Mexico

Flip Nicklin / Whale Shark (Rhincodon typus) with Pilot Fish (Naucrates ductor) and Remoras (Remora sp), Baja California, Mexico

Norbert Wu / Orca (Orcinus orca) spyhopping in icebreaker channel, must find open pockets of water to breathe, watched by pilots and researchers, McMurdo Sound, Antarctica

Ingo Arndt / Helicopter pilot Peter Garden with his helicopter for South Georgia Heritage Trust Rat Eradication Project, Grytviken, South Georgia Island

Mike Parry / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Mike Parry / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Hiroya Minakuchi / Oceanic White-tip Shark (Carcharhinus longimanus) with symbiotic Pilot Fish (Naucrates ductor), Hawaii

Flip Nicklin / Whale Shark (Rhincodon typus) swimming underwater with symbiotic Pilot Fish (Naucrates ductor), Baja California, Mexico

Gerry Ellis / African Elephant (Loxodonta africana) orphan, Thoma, who is being loaded into plane for trip to orphanage is rescued by Edwin, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Franco Banfi / RF - Sea tomato jellyfish (Crambione mastigophora) with juvenile Pilot fish (Naucrates ductor) among its tentacles, drifting close to surface with sunrays, Kei Islands, Moluccas, Indonesia, Banda Sea,...

Franco Banfi / Sea tomato jellyfish (Crambione mastigophora) drifting with juvenile Pilot fish (Naucrates ductor), Kei Islands, Moluccas, eastern Indonesia, Banda Sea, southwest Pacific Ocean.

Henley Spiers / Green turtle (Chelonia mydas) juvenile, swimming in open ocean accompanied by two Pilot fish (Naucrates ductor) and a Remora, eastern Pacific Ocean. Endangered.

Henley Spiers / Green turtle (Chelonia mydas) juvenile, swimming in open ocean accompanied by two Pilot fish (Naucrates ductor) and a Remora, eastern Pacific Ocean. Endangered.

Shane Gross / Whale shark (Rhincodon typus) swimming close to surface accompanied by three Pilot fish (Naucrates ductor) with snorkeler swimming above, La Ventana, Baja California, Sea of Cortez, Mexico. Endangered...

Henley Spiers / Green turtle (Chelonia mydas) juvenile, swimming in open ocean, with two Pilot fish (Naucrates ductor) and a Remora (Echeneidae) swimming alongside, Eastern Pacific Ocean. Endangered.

Doug Perrine / Blue shark (Prionace glauca) with small parasites attached on side of head and under mouth, accompanied by Pilot fish (Naucrates ductor), Baja California Sur, Mexico, Pacific Ocean.

Doug Perrine / Blue shark (Prionace glauca) with small parasites attached on side of head and under mouth, accompanied by Pilot fish (Naucrates ductor), Baja California Sur, Mexico, Pacific Ocean.

Franco Banfi / Loggerhead sea turtle (Caretta caretta) accompanied by Imperial blackfish (Schedophilus ovalis) and Pilot fish (Naucrates ductor) Vulnerable (IUCN). Azores, Atlantic Ocean.

Doug Perrine / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by Pilot fish (Naucrates ductor), and small Remora (Remora sp.) fish, Big Island, Hawaii, Pacific Ocean.

Magnus Lundgren / Whale shark (Rhincodon typus) with Pilot fish (Naucrates ductor) swimming in front, Triton bay, West Papua, Indonesia, Pacific Ocean. European Wildlife Photographer of the Year Competition 2017 - Th...

Shane Gross / Whitetip shark (Carcharhinus longimanus) and Pilot fish (Naucrates ductor) with an underwater photographer, Tubuai, French Polynesia, Pacific Ocean.

Shane Gross / Whitetip shark (Carcharhinus longimanus) and Pilot fish (Naucrates ductor) with an underwater photographer, Tubuai, French Polynesia, Pacific Ocean.

Shane Gross / Whitetip shark (Carcharhinus longimanus) and Pilot fish (Naucrates ductor) being watched by divers, Tubuai, French Polynesia, Pacific Ocean.

David Fleetham / Seven pilot fish (Naucrates ductor) accompany oceanic whitetip shark (Carcharhinus longimanus) several miles off Big Island in open ocean, North Pacific, Hawaii, USA.

Franco Banfi / Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Santa Maria Island, Azores, Portugal, Atlantic Ocean. Vulnerable.

Franco Banfi / Snorkeler swimming with Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Santa Maria Island, Azores, Portugal, Atlantic Ocean. Vulnerable.

Franco Banfi / Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Vulnerable. Santa Maria Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Vulnerable. Santa Maria Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Vulnerable. Santa Maria Island, Azores, Portugal, Atlantic Ocean

Sergio Hanquet / Pilot fish (Naucrates ductor) two, Tenerife, Canary Islands.

Sergio Hanquet / Pilot fish (Naucrates ductor) two with one sheltering under a drifting plastic lid. Tenerife, Canary Islands.

Sergio Hanquet / Pilot fish (Naucrates ductor) profile, Tenerife, Canary Islands.

Franco Banfi / Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) with damaged jaw and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) with damaged jaw and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Scuba divers with Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Couple of Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) with fishing hook caught in mouth and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) with fishing hook and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) with a yellow rubber hoop stuck around its neck (a diver's regulator holder), accompanied by Pilotfish (Naucrates ductor). This shark was photographed...