Dinosaurs first emerged 230 million years ago, became the dominant group of terrestrial animals 205 million years ago, and their reign came to an end only 65 million years ago. For so long did the dinosaurs reign supreme that T-rex, Triceratops and Ankylosaurus are closer in time to us than they are Brachiosaurus, Allosaurus and Stegosaurus.
And to think, even though they're not as prevalent as the used to be, there's 10,000 species alive today.
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Absolutely yes. There was no way for them to evolve enough to survive the effects of the Chicxulub asteroid or the Deccan Traps, but remnants remain. I like my example better than yours. The Red Legged Seriema...
... with a sickle claw that would make a veloviraptor smile.
You could theorize that they didn't die out.0