Eristalis pertinax, Heeswijk-Dinther, Netherlands

"Eristalis pertinax" is a European hoverfly, also known as the drone fly. Like "Eristalis tenax", the larva of "E. pertinax" is a rat-tailed maggot and lives in drainage ditches, pools around manure piles, sewage, and similar places containing water badly polluted with organic matter.