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

Rick Tomlinson / Pilot Cutter "Polly Agatha" sailing past the Needles Lighthouse during Round the Island Race, The British Classic Yacht Club Regatta, Cowes Classic Week, July 2008

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.

Nuno Sa / Whale Shark (Rhincodon typus) accompanied by Pilot Fish (Naucrates ductor) and Remora. The biggest fish in the world has only started to visit the Azores in the past three years due to water temperatu...

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) with Pilot fish (Naucrates ductor). Tropical West Atlantic Ocean, off Cat Island, Bahamas.

Mark Carwardine / Short-finned pilot whale (Globicephala macrorhynchus) surfacing adn blowing, Sea of Cortez, Baja California, Mexico

Jeff Wilson / Rear view of pilots and Trango towers in the Karakoram Mountains, Himalayas, Pakistan, from Pakistani military helicopter, for BBC series Planet Earth. April 2005

Mark Carwardine / Short-finned pilot whale (Globicephala macrorhynchus) juvenile swimming alongside mother, Sea of Cortez, Baja California, Mexico

Mark Carwardine / Short-finned pilot whale (Globicephala macrorhynchus) at surface, Sea of Cortez, Baja California, Mexico

Mark Carwardine / Short-finned pilot whale (Globicephala macrorhynchus) at surface, Sea of Cortez, Baja California, Mexico

Mark Carwardine / Short-finned pilot whale (Globicephala macrorhynchus) bow-riding in front of boat, Sea of Cortez, Baja California, Mexico

Mark Carwardine / Short-finned pilot whale (Globicephala macrorhynchus) breaching, Sea of Cortez, Baja California, Mexico