 The arrival of migrating songbirds, flycatchers, hummingbirds, and shorebirds across America peaks from the last week of April to the last week of May (Dickcissel photo by Paul Konrad).  The BirdCast project mapped out the weeks of peak spring bird migration, defined as the periods with the highest nightly average of aerial bird density, using data collected from 143 radar systems from coast to coast (map by Audrey Carlsen, data analysis by Adriaan Dokter, migration data from BirdCast and eBird).  A stop-action look at the live BirdCast Map for very early Monday morning, April 24. It
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