Mark Moffett / Leafcutter Ant (Atta cephalotes) worker carries leaf with its jaws full, workers carrying leaves must rely on a special cast of smaller ants riding on the leaves to defend against Phorid fly (Phoridae...

Emanuele Biggi / Peruvian Tarantula (Pamphobeteus sp.), young individual parasitized by Phoridae fly larvae, Los Amigos Biological Station, Madre de Dios, Amazonia, Peru.

John Abbott / Phorid fly (Pseudacteon tricuspis) female attacking Fire Ants (Solenopsis invicta). Travis County, Texas, USA. Captive. March

John Abbott / Phorid fly (Pseudacteon tricuspis) female attacking Fire Ants (Solenopsis invicta). Travis County, Texas, USA. Captive. March

John Abbott / Phorid fly (Pseudacteon tricuspis) female attacking Fire Ants (Solenopsis invicta). Travis County, Texas, USA. Captive. March

Jussi Murtosaari / Flies (Brachycera) on leaf, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. June

Jussi Murtosaari / Fly (Brachycera) on Lily of the Valley berries, Parikkala, Etela-Karjala / South Karelia, Etela-Suomi / South Finland, Finland. September

Michael Durham / Female Phorid / Shuttle fly (Pseudacteon obtusus) in flight above Red imported fire ants (Solenopsis invicta) searching for an ant to implant with an egg, Texas, USA, March.

Michael Durham / Phorid Fly (Pseudacteon obtusus) female flies above Red Imported Fire Ants (Solenopsis invicta) searching for an ant to implant an egg which eventually kills the ant, the fly is now used to help contr...

Mark Moffett / Leafcutter Ant (Atta cephalotes) worker carries leaf with its jaws full, workers carrying leaves must rely on a special cast of smaller ants riding on the leaves to defend against Phorid fly attack, F...

Mark Moffett / Phorid fly attacks unsuspecting Leafcutter Ants (Atta cephalotes) working with heads buried in flower, French Guiana

Mark Moffett / Phorid fly attacks unsuspecting Leafcutter Ants (Atta cephalotes) working with heads buried in flower, French Guiana