Four Brothers Islands Friday, 2 May:  I counted 61 Caspian Terns on 
Island C, where they have nested for the past 4 years; some were already 
incubating.  It was interesting to see some of the terns offering 
alewives, instead of smelt, as part of their breeding behavior.  My 
partner, Scott, spotted a Peregrine Falcon, which spent a few minutes on 
the cliff face of Island A.  A couple of cleanly eaten Ring-billed Gulls 
on Island C suggested the falcon visits regularly. Scott spotted a pair 
of Gadwalls also. Other notable birds include Great Egrets, 3 nesting 
pairs, I think; 24 Great Blue Herons on nests; and a good number of 
Black-crowned Night Herons.