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

Flip Nicklin / Manta Ray (Manta birostris) with two Remora (Remora remora) attached to it, Hallcion Reef, Cocos Island, Costa Rica

Flip Nicklin / Sperm Whale (Physeter macrocephalus) adult with attached Remoras skimming ocean surface, Dominica

Norbert Wu / Remora (Remora remora) top of head modified with plates to stick onto animals, worldwide

Pascal Kobeh / Sicklefin devil ray / 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.

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

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

Alex Mustard / Remora (Remora remora) schooling beneath dive boat on a coral reef. North Male Atoll, Maldives. Indian Ocean.

Alex Mustard / Remora fish (Remora remora) showing adhesive disc or sucker plate, Bimini, Bahamas. Gulf Stream, tropical West Atlantic Ocean

Mark Carwardine / Blue Whale (Balaenoptera musculus) dorsal fin with two remoras and barnacles, Gulf of California, Baja California, Mexico

Pete Oxford / Whale Shark (Rhincodon typus) and Remoras (Remora sp), Cenderawasih Bay, West Papua, Indonesia