This morning there were two swallows at the nest site.
 One flew to the nest and the other perched nearby as
i approached.  At the nest site and when they flew
there was some aggression displayed between them, but
i couldn't say if the nest sitter was the aggressor. 
Farther away from the nest site the two were joined in
flight by a third swallow.  Maybe this is a positive
development for the surviving mate, or maybe another
pair is attempting a nest takeover which in itself
would not be a bad outcome...

Jim (Michael) Speicher
jugornought?at?yahoo-dot-com
Bethesda  AT work :(
Broad Run_S. FRED Co  AT home :)