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Robins pincushion gall caused by Gall wasp (Diplolepis rosae) on wild Dog rose (Rosa canina), Peak District National Park, Derbyshire, UK. September
Mistletoe (Viscum album) close-up of berries, England, December
American dog tick (Dermacentor variabilis) adult female, PA, Morris Arboretum, Philadelphia, Pennsylvannia, USA, June
Head Louse (Pediculus humanus capitus) Brackenridge Field Laboratory, Austin, Travis County, Texas, USA
Dog flea {Ctenocephalides canis} UK
Parasitoid wasp (Ichneumonidae) carrying a large paralysed caterpillar to its nesting hole, The Peloponnese, Greece, May 2009
Southern right whale (Eubalaena australis) with calluses covered in parasitic crustaceans named cyamids or whale lice (Cyamus ovalis)
Zebra / Urchin Crab {Zebrida adamsii} pair parasitic on Sea urchin {Toxopneustes pileolus} Wakayama, Japan
Galls of the Silk button gall wasp (Neuroterus numismalis) on the underside of a fallen Oak (Quercus sp. ) leafGalls of the Silk button gall wasp (Neuroterus numismalis) on the underside of a fallen Oak (Quercus sp.) leaf. A single adult wasp will emerge from each gall, Peak District National Park
Eastern bentwing / Eastern long fingered bat (Miniopterus orianae oceanensis) hibernating cluster in cave, one bat with bat fly (Hippoboscoidea) Girraween National Park, Queensland, Australia
Eastern long fingered bat (Miniopterus orianae oceanensis) roosting in a cluster on roof of a cave during day, a few ectoparasitic batflies (Hippoboscoidea) are visible, Girraween National Park
Portrait of a Blackbar soldierfish (Myripristis jacobus) infected with Cymothoid isopod parasites. The large parasite between the eyes is a female, the smaller individuals are males
Woodland surrounding Veliki Prstavci waterfalls, with Mistletoe (Viscum album) on European beech (Fagus sylvatica) growing on the tree branches. Plitvice Lakes National Park, Croatia. November
Southern right whale (Eubalaena australis) with patches covered in parasitic crustaceans named cyamids or whale lice (Cyamus ovalis)