A pair of odorous house ants, Tapinoma sessile, tends to a colony of green aphids on the underside of a leaf (Iowa, USA).
Widefooted Treehopper, Campylenchia latipes (Iowa, USA).
Minute Pirate Bug (Anthocoridae - Orius insidiosus) from Iowa, USA. These swashbuckling hemipterans prey on small invertebrates and pillage their eggs, a trait that makes them attractive as biological control agents.