Alex Mustard / Commensal emperor shrimp (Periclimenes imperator) moves across the colourful red patterned surface of its host Candycane sea cucumber (Thelenota rubralineata). Misool, Raja Ampat, West Papua, Indonesi...

Alex Mustard / Pink anemonefish (Amphiprion perideraion) looks out from its host Magnificent sea anemone (Heteractis magnifica) Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocea...

Jabruson / Hammer Headed bats (Hypsignathus monstrosus) in gloved hand - live mist net catch for blood sampling in search of the unknown reservoir host for Ebola virus. Ebola outbreaks in Mbomo in 2003 killed 12...

Alex Mustard,Alex Mustard / A portrait of a small Candy stripe shrimp (Lebbeus grandimanus) in front of its host pink anemone (out of focus because of the magnification). Browning Wall, Browning Pass, Port Hardy, Vancouver Islan...

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).

Juergen Freund / Pink anemonefish (Amphiprion perideraion) hiding amongst the tentacles of its closed anemone host, Kimbe Bay, West New Britain, Papua New Guinea.

Alex Hyde / Giraffe necked weevil {Trachelophorus giraffa} male on leaf of host plant (Dichaetanthera cordifolia) tropical rainforest, Mantadia NP, Madagascar

Tim Laman / Strangler Fig (Ficus sp.) that has killed its host tree long ago. The host has rotted away, leaving a hollow center. Lowland rainforest in Borneo. Gunung Palung National Park, Indonesia.

Wild Wonders of Europe / Benvie / Broomrape (Cistanche phelypaea) in flower, killing its host Glasswort (Salicornia sp) Huelva, Andalucia, Spain, April 2009

Hiroya Minakuchi / Pink Anemonefish (Amphiprion perideraion) in Magnificent Sea Anemone (Heteractis magnifica) host tentacles, Celebes Sea

Georgette Douwma / Pink anemonefish (Amphiprion perideraion) in host anemone. Papua New Guinea.

Pete Oxford / Madagascar Moon Moth (Argema mittrei) male on Jamun (Eugenia jambolana) leaves in the eastern highlands south of Antananarivo, Madagascar