Here's a great segment on how we know birds are dinosaurs from the PBS Youtube series "It's Okay To Be Smart"
Eating turkey this holiday season? Chowing down on a roast chicken? You’re eating a dinosaur! Entertain your family and friends with a little science lesson this year, and show them why bird bones tell us that birds are actually living dinosaurs. Comparative anatomy of dinosaurs and chicken - HHMI https://www.hhmi.org/biointeractive/c...