Today, being "birdbrained" means forgetting where you left your keys or wallet. But 66 million years ago, it may have meant the difference between life and death—and may help explain why birds are the only dinosaurs left on Earth.
Bird brains left other dinosaurs behind — Science Bulletin
Big brains may have helped birds survive dinosaur-killing asteroid - ABC News
Paleontology News - Page 18 of 44 - SciTechDaily
Brain News & Research Breakthroughs - Page 60 of 79 - SciTechDaily
Dinosaur bird hi-res stock photography and images - Alamy
Theropoda - an overview
How Birds Evolved from Dinosaurs
Wonderchicken” – Origin of Modern Birds Revealed by Fossil From the Age of Dinosaurs
How Birds Evolved from Dinosaurs
The Oldest Bird Voice Box Ever Found - The New York Times
On birds—feathered messengers from deep time
Bird Brains Left Other Dinosaurs Behind - UT News