For a change of pace around here. Â These were photographed last weekend in Brownfield Woods in Urbana, Illinois.

A micropezid fly guards a prime patch of bird poop

A scuttle fly (Phoridae) on a mushroom

Chrysopilus sp. (Rhagionidae)

Long-legged fly (Dolichopodidae)
If any of you Diptera-inclined folk can give me more specific identifications I'd really appreciate it.
Great fly shots! I know the families, but not much more. Sorry.
The Rhagionidae is Chrysopilus thoracicus (Fabricius)
The Micropezidae is Rainieria antennaepes (Say)