According to the migration chart for last year, Diskcissels do not arrive
until about Jun 1.
I see that there have been 3 reports for this year, starting in the middle
of Apr, by Bill Unzen in Lac Qui Parle county.
http://www.moumn.org/jpgraph/migration.php?species=Dickcissel
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David Cahlander david@cahlander.com Burnsville, MN 952-894-5910