While doing a survey at the Franklin County Airport on Sunday, I observed a
flyover of a falcon-shaped bird that was definitely too large and too dark to be
a Kestrel.  Since my experience with Peregrines in flight is very limited, I
don't trust an ID without seeing the sideburns.
My question is whether anyone knows of  any Peregrine nesting sites in Franklin
County.  (I'm not asking for precise locations, as I know this can be a
sensitive issue.)  It generally doesn't seem like the right terrain (no suitable
cliffs that I know of).  And how likely is it that one would just be passing
through at this time without a nest site nearby?

Ken Copenhaver
Fairfax