While mopping up several OBBA blocks nearby, I stopped at the Slate Run Wetlands and was rewarded with 3 Black Terns in the wetlands around the boardwalk part of the loop.  The birds were perching, flying, and feeding, and appeared quite content (so they may stay for a bit).  Other birds of note included:

Great Egret - 1
Green Herons - 3
Wood Ducks - several females with broods of large young
Pied-billed Grebe - 1 calling
E.Kingbirds - 4+
Willow Flycatchers - 2-3 calling
Tree Swallows - 40+
Bank Swallows - 10
Rough-winged Swallows - 4
Purple Martins - 10

The water was high in most of the wetlands, so this will not be a good shorebird spot for a while yet.  It was difficult to accurately estimate swallow numbers, since the intermittent rain this morning caused a lot of them to sit.  There may have been many more that I overlooked.  Oddly enough, Rough-wings were much more common along roads outside the park, mostly near Little Walnut Creek.
  Although there were lots of singing Field & Song Sparrows, there were no other interesting sparrows.  There were also no Sedge Wrens, despite what appears to be acres of habitat.

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