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Podcast: BirdNote Daily
Episode: Migration Routes Evolve
Description: Why do birds consistently follow certain routes in their migrations? Pathways of migration evolved, shaped by the wind. During the height of the last ice age, ice-free breeding habitat for songbirds remained in what is now Alaska and parts of Western Canada. Studies of fossil pollen show that consistent winds blew across the continent on a northwest-southeast heading of 155 degrees. Scott Weidensaul recounts in his book Living on the Wind, “A powerful high-pressure center over central Canada pumped strong northwest winds, precisely the conditions that would aid migrants.” The birds rode these tailwinds to traverse the ice fields. And toda...