<http://schema.org/description>
"Early birds evolved from feathered dinosaurs with four wings but soon ditched &amp;quot;training wheels&amp;quot; for more efficient two-winged flight, Chinese scientists say."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Science_News/2013/03/14/Study-Early-birds-possibly-had-four-wings/UPI-48691363311216/>