I recently discovered a wonderful one-stop shop for links to animated representations of bird migrations on Nexrad radar. It’s fascinating stuff, and wonderfully compiled on a website produced by Dr. Paul Hurtado at the Ohio State University.
From that website, I downloaded the following 7 snapshots of bird migration across the Lower 48 states during a peak time for bird movements: the week from 14–20 September, 2012. I took screenshots of radar images between 12:00 and 1:00 am when most birds would be in flight. The resulting images offer a dramatic look at one of the most amazing wildlife spectacles on the planet, and one of which most people are blissfully unaware. Their loss, in my estimation: