Radar ornithology has been around for a couple decades but with more recent improvements in radar technology (what are we up to now, Doppler 7 million or something ?) you can get cooler and more useful information. The premise is that birds, like you and me, are made up mostly of water, and as they most through the sky Doppler radar, which detects water movement in the air, picks up those moving globs of water with feathered membranes. You can use this information to identify key migration habitats and perhaps move toward conserving those sites. This video is pretty cool and shows early evening bird movements from radar imagery.
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