Experts are still arguing over whether Archaeopteryx was a true bird, or a paravian dinosaur, or some other kind of dino. But regardless of what side you're on, how did this fascinating, bird-like animal relate to today's birds? It turns out its teeth were a clue that this story goes all the way back to what we now call the non-avian dinosaurs.

Originally released by Knowledgemotion, 2018. Streaming video file encoded with permission for digital streaming by Infobase on February 21, 2020.

When Birds Had Teeth (12:21); .