Walter's note re Carolina Wren feeding Cowbird reminded me,
while atlasing this past Sunday in Patapsco State Park upstream
from Ellicott City, noted a streaked bird following a pair of 
Carolinas, that I suspected might be a juvenile Cowbird.  I
just consulted Sibley, it was, indeed.  So that's TWO instances
of Cowbirds parasitizing Carolina Wrens in one week!

The block was EC-SE, QB1.  Alas, both species already
confirmed, and closed out for the Block.

Kurt Schwarz
Ellicott City
goawaybird at comcast dot com