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

Fossils of early birds from after the extinction show rapid diversification.

96% confidence

Fossil discoveries from shortly after the extinction event show a rapid increase in the diversity of bird species. This burst of evolution, sometimes called the 'avian radiation,' allowed birds to fill ecological niches left vacant by extinct animals. It explains the vast variety of bird species present today, from ground dwellers to skilled flyers.

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The Dinosaur That Survived: How Birds Became Earth’s Living Dinosaurs
Evidence, perspectives, rabbit holes, and more