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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.
FAQ
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
http://www.accuweather.com/blogs/Weathermatrix/story/19714/20000000-bats-on-radar.asp