I need to get some sleep now, but just came in from deck after listening 
to lots of thrushes passing overhead.  Seemed to be mostly Swainson's.  
I cannot quite tell the others apart yet w/o help from spectrograph.  
But I'm starting to hear the differences in the calls.  Also, two 
cuckoos passed overhead and as a bonus I heard a distant Barred Owl 
calling from direction of Muddy Branch Creek.

Andy Martin
Gaithersburg