Science Quickly Why birds outlived T. rex
12 snips
Apr 17, 2026 
Steve Brusatte, paleontologist and evolution professor who studies dinosaur-to-bird transitions, discusses how modern birds emerged from feathered dinosaurs. He recounts the ancient world of giants and the Chicxulub impact. He explores which traits like small size, seed diets, flight and fast reproduction helped birds survive. He reflects on what those survival patterns mean for rapid environmental change today.
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Birds Evolved From Small Feathered Dinosaurs
- Birds are dinosaurs that evolved from small, feathered theropods and began diversifying into flying forms by the end of the Jurassic.
- Early birds had teeth, long tails, and claws but gradually evolved beaks, hollow bones, larger flight muscles, and rapid growth for efficient flight.
Asteroid Triggered A Global Impact Winter
- The Chicxulub impact caused global fires, soot and dust that blocked sunlight for years, collapsing plant-based food webs on land and in oceans.
- The impact's immediate shocks plus prolonged 'impact winter' led to ~75% species loss and ecosystem collapse.
Big Size And Slow Growth Were Fatal
- Large size, slow growth, and high food demands made big non-avian dinosaurs like T. rex and Triceratops vulnerable after the impact.
- Species bigger than a husky dog mostly died because they couldn't find enough food or hide from rapid catastrophes.
