You might be able to do it with a digital SLR camera in continuous shoot
mode. If the camera shoots fast enough relative to the speed of the swifts
entering the chimney, a careful look at the photos could possible allow
identification of individual birds. From the number of swifts that
"disappear" into the chimney per frame and the rate per second that the
camera is shooting, you should be able to figure out how many swifts are
going into the chimney per minute. From that number you could estimate the
total for the entire time.

Marvin S. Hoekstra
Sammamish, WA
marvin dot hoekstra at verizon dot net




-----Original Message-----
From: tweeters-bounces at mailman1.u.washington.edu
[mailto:tweeters-bounces at mailman1.u.washington.edu] On Behalf Of Larry
Schwitters
Sent: Tuesday, March 18, 2008 1:48 PM
To: Tweeters at u.washington.edu
Subject: [Tweeters] count real fast

Tweeters,

Anyone out there have any ideas on how to get an accurate count of the
number of individual swifts entering a chimney?

Larry Schwitters
Issaquah

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