Many will be interested in this report from Joe Hage, in his Caretaker's Log of the Sycamore Island Club.  The club is located about a mile above the Little Falls Dam on the Potomac (Glen Echo/Cabin John area).  --Dave Winer
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Tuesday-- July 8, 2008 
Water Level at Little Falls: 3.2     Water Temperature: 86 

All you birders out there are going to think I'm crazy, but I'm almost positive that we saw an anhinga fishing off the captains float. I knew immediately when I saw this bird on Sunday morning that it was something unusual. My first thought was, a loon, but this is the middle of summer and I don't think I'm going to see a loon or any other diving ducks. So that left the question, if it wasn't a cormorant, what was diving and coming to the surface and looking all snake-like. Answer, an anhinga. It turns out that their range has been increasing over the years. My bird book from 1980 shows anhingas venturing no further north that North Carolina, but my 2002 bird book shows them moving into the mouth of th chesapeake bay in Virginia.

Maybe I shouldn't be shocked to see an anhinga since we seem to have other birds here that I thought I'd only see in Florida. We have a pair of Great white egrets and this morning a completely white, immature little blue heron flew over me on the ferry.