Alex Hyde / Human Head Louse (Pediculus humanus capitis) macro shot of claw, that allows the louse to grip onto the hairs of their human host, False-colour scanning electron micrograph (SEM).

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

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

Hiroya Minakuchi / Gray Whale (Eschrichtius robustus) with barnacles and whale lice, Baja California, Mexico

Piotr Naskrecki / Vampire Bat (Desmodus rotundus) with parasitic Louse Flies (Trichobius parasiticus) behind its ear, Sipaliwini, Surinam

David Maitland / Pigeon louse fly (Ornithomya avicularia) amongst the feathers of a Tawny Owl (Strix aluco). Feltwell, Norfolk, UK.

David Maitland / Pigeon louse fly (Pseudolynchia canariensis) amongst the feathers of a Tawny Owl (Strix aluco). Feltwell, Norfolk, UK.

Stephen Dalton / Swallow louse fly (Stenepteryx hirudinis) parasitic on swallows, swifts and martins, note atrophied wings

Stephen Dalton / Bird louse {Philopteridae} gripping peacock's feather, UK

Stephen Dalton / Bird louse {Philopteridae} gripping peacock's feather, UK

Stephen Dalton / Bird louse {Philopteridae} gripping peacock's feather, UK

Stephen Dalton / Lice {Phthiraptera} feeding on fungus, Sussex, UK

Stephen Dalton / Fly with parasitic lice attached to it, UK

Stephen Dalton / European water spider {Argyroneta aquatica} underwater with louse prey, UK, Argyronetidae

Fred Bavendam / Orangelined Cardinalfish (Archamia fucata) with a parasitic Fish Louse (Caligus sp) attached to its side, Nusa Tenggara, Indonesia

Albert Lleal / Human Louse (Pediculus humanus) SEM close-up view of egg on human hair at 35x magnification

Albert Lleal / Human Louse (Pediculus humanus) SEM close-up view of prehensile leg and human hair at 210x magnification

Albert Lleal / Human Louse (Pediculus humanus) SEM close-up view of individual between human hair at 28x magnification

Albert Lleal / Common Bark Louse (Psocidae) SEM close-up view at 140x magnification

Kim Taylor / Fish Louse (Copepoda) female carrying egg pouches, taken from Sea Bass (Dicentrarchus labrax)

PREMAPHOTOS / Human head louse {Pediculus humanus capitis} amongst hair, UK

Willem Kolvoort / Common freshwater louse mating (Asellus aquaticus) Holland

Willem Kolvoort / Common freshwater louse (Asellus aquaticus) Holland

Willem Kolvoort / Common freshwater louse (Asellus aquaticus) Holland

Willem Kolvoort / Common freshwater louse (Asellus aquaticus) Holland

Kim Taylor / Fish louse {Caligus sp} showing egg sacs

Kim Taylor / Book louse walking over book {Psocoptera sp} UK.

Kim Taylor / Slender pigeon louse {Columbicola columbae} on dove feather, UK.

Kim Taylor / Marine fish louse {Copepoda} clinging to eye of Sea bass

Duncan Mcewan / Jumping plant louse {Psylla alni} UK.

Duncan Mcewan / Jumping plant louse {Psylla alni} UK.

SINCLAIR STAMMERS / Egg of Head louse {Pediculus humanus capitis} on strand of human hair

Kim Taylor / Slender Pigeon Lice (Columbicola columbae) on feather, UK.

Hiroya Minakuchi / Gray Whale (Eschrichtius robustus) skin with barnacles and sea lice, San Ignacio Lagoon, Baja California, Mexico

Adrian Davies / Water louse magnified x.75, freshwater, UK

Adrian Davies / Water louse {Asellus aquaticus} magnified x.75. Freshwater, UK.

Adrian Davies / Amphipod (Gammarus locusta x5) underwater. Wales, UK, Europe

Hiroya Minakuchi / Southern Right Whale (Eubalaena australis) with Kelp Gull (Larus dominicanus) picking off lice, Valdes Peninsula, Argentina