David Hall / Sandperch (Parapercis sp) with two Isopod (Cymothoidae) ectoparasites on body. Pantar, Alor Archipelago, Indonesia.

Emanuele Biggi / Earwig (Arixenia sp), an ectoparasite that feeds exclusively on the dead skin of bats. Deer Cave, Gunung Mulu National Park, Borneo, Sarawak, Malaysia.

Tony Wu / Humpback whale (Megaptera novaeangliae) calf with an infestation of whale lice (Cyamus boopis), an ectoparasite that lives exclusively on humpback whales, Vava'u, Tonga, South Pacific

Michael Durham / Bat bug (Heteroptera) ectoparasite feeding on part of the wing of a Big brown bat (Eptesicus fuscus) Arizona, USA, July.

SINCLAIR STAMMERS / Cattle biting louse (Damalinia bovis) on hairs, in temperate climates cattle may be infested with this species of Mallophaga. Length 3mm approximately

Chien Lee / Earwig (Arixenia sp) an ectoparasite that feeds exclusively on dead skin of the Naked Bat (Cheiromeles torquatus), Gunung Mulu National Park, Malaysia

PREMAPHOTOS / Sheep tick (Ixodes ricinus) fully engorged female on a cat, UK

Michael Durham / True Bug, an ectoparasite feeding on part of the wing of a Big Brown Bat (Eptesicus fuscus)

Franco Banfi / Ringneck blenny (Parablennius pilicornis) with isopod parasite (Cymothoidae) sitting on its head, Marine Protected area Punta Campanella, Costa Amalfitana, Italy, Tyrrhenian Sea, Mediterranean.

Franco Banfi / Ringneck blenny (Parablennius pilicornis) with isopod parasite (Cymothoidae) sitting on its head, Marine Protected area Punta Campanella, Costa Amalfitana, Italy, Tyrrhenian Sea, Mediterranean.

Bruce Thomson / Eastern bentwing / Eastern long fingered bat (Miniopterus orianae oceanensis) hibernating cluster in cave, one bat with bat fly (Hippoboscoidea) Girraween National Park, Queensland, Australia.

Bruce Thomson / Eastern bentwing / Eastern long fingered bat (Miniopterus orianae oceanensis) hibernating cluster in cave, one bat with batfly (Hippoboscoidea) Girraween National Park, Queensland, Australia.