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Nature - Earth Navigators

Earth Navigators Earth Navigators
Seasonal changes impel a wide variety of creatures, from whooper swans to monarch butterflies, to begin their epic migrations to ancient feeding, mating, and breeding grounds, sometimes covering thousands of miles and employing ingenious methods to reach their destinations.
http://video.pbs.org/widget/partnerplayer/1300472956/?player=WGBY-PBS&w=512&h=288&chapterbar=true&autoplay=false Seasonal changes impel a wide variety of creatures, from whooper swans to monarch butterflies, to begin their epic migrations to ancient feeding, mating, and breeding grounds, sometimes covering thousands of miles and employing ingenious methods to reach their destinations. /episodes/get/2055 /episode/2055 Nature: Earth Navigators /episode-player/2055
2055