Cretaceous–Paleogene extinction event

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What Wikipedia says

The Cretaceous–Paleogene (K–Pg) extinction event, formerly known as the Cretaceous–Tertiary (K–T) extinction event, was a major mass extinction of three-quarters (75%) of the plant and animal species on Earth which occurred around 66 million years ago.

Excerpt from the Wikipedia article “Cretaceous–Paleogene extinction event”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: The original uploader was Fredrik at English Wikipedia., Public domain, via Wikimedia Commons.