I went back to Centennial Lake around 11:00 am to get some serious 
exercise (as opposed to strolling around birding).  I did still carry 
binoculars, though.

The Red-breasted Mergansers were still there.

Also, there were 3 more swallows.  These were different swallows than 
the ones I saw before.  The 3 new swallows were very definitely Tree 
Swallows -- I could clearly see the green/blue backs and white bellies, 
in spite of the same crummy lighting conditions as earlier.

-- 
June Tveekrem
Columbia, Howard Co, MD
tweekiebird AT toadmail DOT com