Early Bird Species Had Four Wings, Scientists Find

[unable to retrieve full-text content]Some bird species had a four-wing body plan before they lost hind-limb feathers and started to use those limbs to walk, scientists reported Thursday.

Source: http://www.nytimes.com/2013/03/15/science/early-bird-species-had-four-wings-scientists-find.html?partner=rss&emc=rss

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