From: The Dinosaur That Survived: How Birds Became Earth’s Living Dinosaurs
evidencehistorical

Non-avian dinosaurs went extinct at the Cretaceous-Paleogene (K-Pg) boundary, but avian dinosaurs survived.

98% confidence

The mass extinction event at the K-Pg boundary, about 66 million years ago, caused the extinction of all non-avian dinosaurs. However, fossil records show that certain bird lineages persisted beyond this boundary and diversified in the Paleogene period. This indicates that birds, the avian dinosaurs, were the sole dinosaur group to survive and continue evolving.

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evidence
Fossils of early birds from after the extinction show rapid diversification.
evidence
Small body size and flight ability helped some dinosaurs survive the mass extinction.
evidence
Molecular studies support the dinosaurian origin of birds.
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The Dinosaur That Survived: How Birds Became Earth’s Living Dinosaurs
Evidence, perspectives, rabbit holes, and more