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.
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Brownfield woods, Urbana, Illinois
photo details: Canon 17-40x wide angle lens on a Canon EOS 50D
ISO 400, 1/30 sec, f/7.1, leaf backlit with handheld 550ex strobe.
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Great fly shots! I know the families, but not much more. Sorry.
The Rhagionidae is Chrysopilus thoracicus (Fabricius)
The Micropezidae is Rainieria antennaepes (Say)