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

Doug Perrine / Humpback whale (Megaptera novaeangliae) calf with Remora fish (Echeneidae) on underside. Vava'u, Kingdom of Tonga, South Pacific.

Shane Gross / Black grouper (Mycteroperca bonaci) with Remora fish (Remora sp). Caribbean Sea off Gardens of the Queen National Park, Cuba.

Tony Wu / Humpback whale (Megaptera novaeangliae australis) vocalising with head-down, attended to by Remoras (Echeneidae sp). Vava'u, Tonga, South Pacific.

Franco Banfi / Sperm whale (Physeter macrocephalus) with Remoras (Echeneidae) and a free diver swimming, Dominica, Caribbean Sea, Atlantic Ocean, Vulnerable species.

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

Hanne & Jens Eriksen / Olive ridley turtle (Lepidochelys olivacea) at surface with Remora (Echeneidae) Oman, October

Hanne & Jens Eriksen / Olive ridley turtle (Lepidochelys olivacea) with Remora (Echeneidae), Oman, October