The k/t mass extinction resulted in a higher survival rate for small creatures.
The Cretaceous-Tertiary extinction, also known as the Cretaceous-Paleogene extinction or K-T extinction, was a worldwide extinction event that eliminated around 80% of all animal species at or very near the border between the Cretaceous and Paleogene periods.
The two theories that propose a catastrophic end to the Cretaceous have been the focus of the most recent research on the K-T extinction: a significant asteroid impact and a massive volcanic eruption.
Birds: Only birds managed to survive the cataclysmic extinction that occurred 65 million years ago for dinosaurs.
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