Dinosaurs first appeared roughly 230 million years ago and eventually became the dominant land animals, holding that status until an asteroid struck Earth 66 million years ago, causing a mass extinction of species.
Why Were There No Tiny Dinosaurs? Mammals Might Have Played A Role
Dinosaurs first appeared roughly 230 million years ago and eventually became the dominant land animals, holding that status until an asteroid struck Earth 66 million years ago, causing a mass extinction of species.
Published: 6 August 2026
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