Thanks for the posting.

I went this evening (9/11). Sunset was at 7:22.  About ten minutes before
that, they started gathering; they were finished "tornadoing in" by about 20
minutes after sunset.  I don't have a lot of experience estimating numbers,
but my guess is about 500.  I've seen some large flocks of large birds on
migration, but never chimney swifts at dusk.  This was quite a sight,
especially in such an urban location.

Gary  Ender
Bethesda

301 229 9118

John Hubbell wrote:

> Chimney Swifts have been roosting for the last week in a chimney above the
> Metro bus garage in NW DC.  The garage is just inside the District line in
> the block formed by Wisconsin Ave, Jenifer St, 44th St, and Harrison St.
> Best viewing is from Jenifer St or 44th.
>
> John Hubbell
> DC