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A fascinating article and image from Birder's World, February 2004, pp. 62-64.
-- Edward Tufte
Radar images of birds
The NWS has a number of images of birds etc echoes on their websites. Note that while WSR-88D is a Doppler radar, few if any of the images shown on the links below are Doppler *velocity* images -- same as your local TV met with a "Doppler" radar only shows you reflectivity. I did see one mention of birds causing a 5% impact on velocity measurements in radar wind cross-sections (VAD) though.
- Mayflys are bird bait.
- Buffalo Research web page, 4-up poster session, PDF paper
- An Investigation of Bird Radar Echoes Detected by the WSR-88D Doppler Radar at NWSO Binghamton, NY
-- William Ricker (email)
Video of 20 million bats on weather radar
-- Niels Olson (email)