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The Great American Biotic Interchange in birds

To: Birding Aus <>
Subject: The Great American Biotic Interchange in birds
From: L&L Knight <>
Date: Fri, 11 Dec 2009 21:30:29 +1000
It appears that many tropical bird species avoided the crossing between North and South America until there was a land bridge connecting the continents. See
http://www.sciencedaily.com/releases/2009/12/091209143743.htm
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