The shell of Hawaiian reef lobster (Enoplometopus occidentalis), covered in algae and parasitic barnacles, Hawaii, United States of America, Pacific, North America

Parasitic Snail, Luetzenia asthenosomae, Ambon, Moluccas, Indonesia

Parasitic strangling fig (Ficus) with roots around a tree, having seeded on a branch and grown downwards, Tangkoko Reserve, Minahasa, Nth Sulawesi, Indonesia, Southeast Asia, Asia

Adult parasitic (Arctic) skua (Stercorarius parasiticus) taking off at Monacobreen, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

A large male Black Ctenosaur (Iguana negra) with parasitic ticks, a lizard species endemic to Central and South America, Nosara, Nicoya Peninsula, Guanacaste Province, Costa Rica, Central America

Mistletoe berries (Viscum album) on female plant growing in an apple tree, Somerset Levels, England, United Kingdom, Europe

Betel nut, reported to be anti-parasitic, laxative and to promote urination, also proven to be a stimulant as it increases heart rate and blood pressure, India, Asia

A juvenile Arctic Skua (Stercorarius parasiticus) on the coast in Northumberland, UK

Parasitic wasp, North West Bulgaria, EuropeOrder Hymenoptera

Australian land leech (Gnatbobdellida libbata) feeding on dog's paw, Hopkins Creek, New South Wales, Australia, Pacific

Insect damage to sandpaper fig leaf (Ficus coronata), Couchy Creek Nature Reserve, New South Wales, Australia, Pacific

Parasite fly or Tachinid fly (Cylindromyia bicolor) feeding on Wild angelica (Angelica sylvestris) umbel flowers, Corsica, France. MORE INFO: Parasite fly or Tachinid fly family Tachinidae, plant family Apiaceae.

Three species of barnacles, Coronula diadema, Cryptolepas rhachianecti, Conchoderma testudini

Adult California gray whale (Eschrichtius robustus) surfacing (note barnacles and whale lice) in the calm waters of Magdalena Bay, Baja California Sur, Mexico.

Batfish (Species unknown) with fish louse. Wakatobi, Onemobaa Island, Indonesia Restricted resolution (Please contact us). (RR)

Tourists being attacked by mosquitos in Camp Victor on Greenland, Polar Regions

Devonshire Cup Coral (Caryophyllia smithii) with Parasitic Barnacles Boscia anglica, Sark, Channel Islands

Tourists being attacked by mosquitos in Camp Victor on Greenland, Polar Regions

Rhagium mordax, Estonia

California gray whale (Eschrichtius robustus) calf surfacing in the calm waters of Magdalena Bay, Baja California Sur, Mexico

A false clown anemonefish, Amphiprion ocellaris, with a parasitic isopod, Cymathoa exigua, inside its mouth, Manado, North Sulawesi, Indonesia, Pacific Ocean

A bush cricket on a Rosmary plant. The atrophied wings of Ephippiger species are unfit to flight and only used for the emission of sounds. This one has some parasitic mites on it

A small metallic bee covered on pollen, it has a parasitic mite on the wing

Sheep Liver Fluke, SEM

Trichomonas Vaginalis

Ascaris Egg, Parasitic Intestinal Nematode

Toxoplasma Gondii

The strings hanging off the dorsal fin of this Great White Shark (Carcharodon carcharias) are parasitic copepods. Photographed just breaking the surface off Guadalupe Island, Mexico

A Slender Spongegoby (Phyllogobius platycephalops) and two different species of crabs. Attached to the goby are several parasites with egg cases, that will likely prove fatal over time. Many species live on the convuluted surface of this sponge, Philippin

These two parasitic mollusks, Thyca crystallina, are growing on the host starfish, Linckia laevigata. This parasitic shell only attaches to this species of starfish, into which it burrows and sucks up nutrients, Philippines

striped triplefin triplefin with parasitic crustacean on back camouflaged on sponge underwater Komodo Island Indonesia Indian Ocean Asia (Helcogramma striata)