The Four-Winged Dinosaur (2008) | Full Documentary | NOVA

Surprising fossils from northeastern China spur a debate over how birds evolved. Welcome to PBS America, a channel curated for an international audience from America's Public Broadcasting Service, PBS. This is a factual focussed channel including award-winning American history, current affairs and science. SIGN UP to our UK broadcast channel weekly highlights at pbsamerica.co.uk FOLLOW us on X @PBSAmerica LIKE us on Facebook.com/pbsamerica