I sorted through the gulls at Schoolhouse Pond during lunch today.  There was 
a big group on the ice, and the highlight was two adult Lesser Black-backed 
Gulls.  The gulls were mixed in with groups of Herring Gulls near the open 
water.  Also present were:

7 Great Black-backed Gulls (3 adults, 1 Ad/4th winter, 1 2nd winter, 2 1st 
winter)
260 Herring Gulls
860+ Ring-billed Gulls.

More gulls were coming in as I returned to the office, and there could easily 
been other rare gulls mixed in with the huge group that I missed.

Also of note, I believe that Trumpeter Swan #962 has left Schoolhouse Pond.  
After seeing the swan almost daily since early May, I have not seen the bird 
since early February.  The last day I saw it was Sunday, February 4th.  

Fred Shaffer
Patuxent MOS