Contrary to popular belief, dinosaurs never went extinct. They're still alive and flying among us - in the form of birds! Birds are the only dinosaurs that survived the cataclysmic mass extinction event caused by an asteroid the size of Mount Everest crashing into Earth about 66 million years ago. The big question is: How? How did birds manage to not only live through the apocalypse that wiped out all the other dinosaurs, but also evolve to populate every corner of the planet? Now, rare fossil discoveries are revealing the secrets of bird evolution going back more than 100 million years, telling the story of how some resilient feathered dinosaurs persevered and transformed into the vast array of colorful bird species that fills the skies today.