Stephen Dalton / Common oak gall wasp (Cynips quercusfolii) exposed inside oak gall, UK

Chris O'Reilly / Cherry galls on Oak sapling caused through parasitism by {Cynips quercusfolii} gall wasp, Mixed woodland, Spring, Derbyshire, UK

Chris O'Reilly / Cherry galls on oak sapling caused through parasitism by {Cynips quercusfolii} gall wasp, Mixed woodland, Spring, Derbyshire, UK

Philippe Clement / Cherry gall on oak leaf caused by Gall wasp {Cynips quercusfolii} Belgium

Brian Lightfoot / Cherry Gall on Oak leaf caused by gall wasp, Cynips quercusfolii, Scotland

Duncan Mcewan / Cherry Gall cut away to show Gall wasp larva (Cynips quercusfolii) inside. On oak tree leaf.

Duncan Mcewan / Cherry gall cut away to see wasp larvae (Cynips quercusfolii). Scotland, UK, Europe

Duncan Mcewan / Cherry galls developing on young oak leaf caused by gall wasp (Cynips quercusfolii). Scotland, UK, Europe

Philippe Clement / Oak galls of {Cynips divisa} on oak leaf Belgium

Robert Thompson / Oak galls made by the Oak gall wasp (Cynops divisa) on fallen oak leaves, Clare Glen, County Armagh, Northern Ireland, UK