How the "Owl Butterfly" may have gotten the spot on its wings. More free lessons at: http://www.khanacademy.org/video?v=dR_BFmDMRaI
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Natural Selection and the Owl Butterfly
How the "Owl Butterfly" may have gotten the spot on its wings. More free lessons at: http://www.khanacademy.org/video?v=dR_BFmDMRaI