I did some midday birding at Frontenac State Park (Goodhue Co.) and found a singing BELL'S VIREO right behind the entrance station.  Other highlights included numerous DICKCISSELS and PURPLE MARTINS around the station and along the Prairie Trail, a probable HENSLOW'S SPARROW singing in the grass along the same trail, and two singing PROTHONOTARY WARBLERS on the Sand Point Trail, just before the boardwalk becomes submerged.

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