This video says about itself:
22 March 2012
Trailer for World Migratory Bird Day. Director: Christian Fischer (www.christianfischer.name) / Composer: Max Würden (www.wuerden.com) / Speaker: Tom Zahner / With original footage by: Mush & Tinbergen, Quite Bright Films, Sergey Panayotov / Animation “Earth from space” ©iStockphoto.com/tetsoo. With creative direction & advice from the WMBD Team! For more information please see: www.worldmigratorybirdday.org or write to: firstname.lastname@example.org
Using weather surveillance radar and citizen-science data, researchers are learning how migratory birds return to their breeding grounds in North America each spring with near-pinpoint accuracy: here.