Natures Wonders- oxygen physiology (Introduction)
by David Turell 
, Tuesday, November 08, 2011, 17:37 (4764 days ago) @ David Turell
How do geese transit over the Himalyas in one day?
http://www.scientificamerican.com/article.cfm?id=olympians-of-the-sky&WT.mc_id=SA_D...
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