Did birds evolve from dinosaurs or reptiles?

The theory that birds came from dinosaurs has been supported by many researchers. There was was a recent NOVA on PBS that I enjoyed. If you missed the show on TV watch NOVA online:It talks about the discovery of a 130 million-year-old fossil of a creature with four wings.

Dubbed Microraptor, the crow-sized fossil is one of the smallest dinosaurs ever found and challenges conventional theories and assumptions about the evolution of flight.

NOVA commissions a model of Microraptor complete with feathers and moving joints to be tested in a wind tunnel.

Their hope is that the model will settle the debate between theories that birds evolved from fast running dinosaurs flapping their feathered arms or reptiles in the trees that glided from the treetops.

Microraptor is the unexpected missing link that has reignited the debate and is a clue from the long-ago era when the ancestors of birds first took to the air.