
Mysteries of Migration
To The Best Of Our Knowledge
00:00
The Great Migrations Are Disappearing
The populations of song birds in eastern north america are down anywhere from 50 to 75 % over the past half century. Certain habitats are destroyed, forests are cleared. It's a bad situation, but it's by no means a hopeless situation. And you do see increase in efforts to protect some of the great animal migrations.
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