Thank you to everyone who responded; your input was extremely helpful and I
wish I'd had more time to follow up on all your suggested references. There
was a pretty clear consensus about the current status of various hawks in
the National Capital area. Translation: You all agreed, so you must be
right!

No species is exactly "thriving" in developed areas, but many are doing all
right. Several natural groupings emerged: First, the raptors that have been
obvious beneficiaries of human actions such as banning DDT and building nest
platforms (Bald Eagle, Osprey, Peregrine). Second, those that tolerate human
presence, are still able to find suitable habitat, and prey on such abundant
urban and suburban critters as squirrels and starlings (Red-tail,
Red-shoulder, Cooper's). Third, those whose numbers are down significantly
due to habitat loss and other factors (Kestrel, Broad-winged, Sharp-shinned,
Harrier). There's also a fourth category of raptors that are increasing
their seasonal presence in our area, presumably due to climate or habitat
changes (Mississippi Kite, Merlin).

Again, thanks to all who wrote.

Janet Millenson
Potomac, MD (Montgomery County)

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"Look at the birds!" -- Pascal the parrot