Natures wonders: Bird Migration (Introduction)

by David Turell @, Thursday, July 31, 2014, 22:11 (3766 days ago) @ David Turell

May be partially controlled by DNA:-http://blogs.discovermagazine.com/inkfish/2014/07/29/when-mom-and-dad-have-different-migratory-routes-kids-fly-right-down-the-middle/


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