Wow! An extinct bird, so big that it ought not to have been able to fly? via @EstherPounds http://www.pbs.org/wgbh/nova/next/evolution/extinct-flying-bird-big-shouldnt-able-fly/ …
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Wow! An extinct bird, so big that it ought not to have been able to fly? via @EstherPounds http://www.pbs.org/wgbh/nova/next/evolution/extinct-flying-bird-big-shouldnt-able-fly/ …