Hi again,
Must be because I am not used to thinking about swallows at this time of
year but I forgot to mention Tree Swallows again. I had a flock of about
30 individuals foraging over the first field after the school on Egypt Rd
and a single bird foraging along the wildlife drive at Blackwater NWR.
Don't worry, I checked them all for Violet-greens and Cave Swallows;-)

Frode Jacobsen
Baltimore, MD