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Cretaceous-Tertiary extinction event

Let's talk about science: Dinosaur watching

Pittsburgh Post-Gazette - ‎Apr 27, 2016‎
All birds belong to the class Aves, the only group of dinosaurs that survived the cretaceous-tertiary (K-T) mass extinction event 65 million years ago. Today there are nearly 10,000 distinct species of birds distributed throughout the world, which is ...