Alex Mustard / Remoras (Remora sp.) hitchhiking on the tail of a large (13-15m) female whale shark (Rhincodon typus) swims in open water. Wolf Island, Galapagos National Park, Galapagos Islands. East Pacific 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

Georgette Douwma / Green turtle (Chelonia mydas) with two large remoras (Echeneis naucrates) attached to its carapace, at rest on artificial reef. Mabul, Malaysia.

Tim Fitzharris / Whale Shark (Rhincodon typus) eating with attendant Remoras (Remora remora), Philippines

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 / Lemon shark (Negaprion brevirostris) accompanied by Remoras (Echeneis naucrates) at night. Little Bahama Bank, Bahamas. Tropical West Atlantic Ocean.

Norbert Wu / Caribbean Reef Shark (Carcharhinus perezii) with remora attached, Bahamas, Caribbean

Doug Perrine / Newborn Lemon shark pup swims away from mother {Negaprion brevirostris} Bahamas, Caribbean (Non-ex).

Michael Pitts / Tiger shark {Galeocerdo cuvieri} with remora fish. South Africa, Atlantic. NB stripes

Juergen Freund / Grey reef shark {Carcharhinus amblyrhynchos} with Remora fish, Great Barrier reef, Queensland, Australia

Jeff Rotman / Zambesi / Bull shark {Carcharhinus leucas} with Remora fish Natal, South Africa