For 30 years scientist John Ostrom has asserted that birds evolved from predatory dinosaurs - a theory that has been hotly disputed. Tonight's documentary looks at recently discovered fossils of feathered dinosaurs in China, which could validate Ostrom's argument, and uses computer animation to bring the velociraptor and archaeopteryx back to life.
See today's choices.
Wallace and Gromit's Pick of the Week: page 42