Check out this video.  While not definitive in all cases it does give some
idea of how swifts line up inside a chimney.

Scott Laurent
Kansas City, MO

On Mon, Oct 8, 2012 at 12:43 PM, Pat Lueders <[log in to unmask]> wrote:

> **
> According to the count, there was a record 590 Chimney Swifts that roosted
> in the Clark School chimney last night, near Big Bend & Rock Hill Rds. in
> Webster Groves.  The largest count we had last year was 338.  It took
> longer for them to enter and there were more late comers than the previous
> evenings.  We wonder if they roost from top to bottom, from bottom to top,
> or randomly grab a spot.  They leave at sunrise in a fairly large group.
> Pat Lueders, Webster Groves, MO
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