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1. • Asteroid impact

     • The non-avian dinosaur part of the evolutionary tree went extinct about 66 million years ago, likely due to a catastrophic event such as an asteroid impact, leaving no real dinosaurs alive today except for their bird descendants.
     science.howstuffworks.com/science-vs-myth/everyday-myths/could-dinosaurs-still-be-alive.htm

     Are Dinosaurs Still Alive? - HowStuffWorks

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   Why are there no non avian dinosaurs alive today?

   • Why are there no non-avian dinosaurs alive today? The non-avian dinosaur part of the evolutionary tree went extinct about 66 million years ago, likely due to a catastrophic event such as an asteroid impact, leaving no real dinosaurs alive today except for their bird descendants.

   Are Dinosaurs Still Alive? - HowStuffWorks

   science.howstuffworks.com/science-vs-myth/everyday-myths/could-dinosaurs-still-be-alive.htm

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   Why did non-avian dinosaurs go extinct 66 million years ago?

   • The question why non-avian dinosaurs went extinct 66 million years ago (Ma) remains unresolved because of the coarseness of the fossil record. A sudden extinction caused by an asteroid is the most accepted hypothesis but it is debated whether dinosaurs were in decline or not before the impact.

   Dinosaur biodiversity declined well before the asteroid impact

   www.nature.com/articles/s41467-021-23754-0

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   Did non-avian dinosaurs die before the asteroid impact?

   • These results support an environmentally driven decline of non-avian dinosaurs well before the asteroid impact. The most famous mass extinction was the disappearance of non-avian dinosaurs at the end of the Cretaceous, 66 million years ago (Mya), after ruling the Earth for 170 million years 1, 2, 3.

   Dinosaur biodiversity declined well before the asteroid impact

   www.nature.com/articles/s41467-021-23754-0

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   Did birdlike dinosaurs survive the extinction event 66 million years ago?

   • Birdlike dinosaurs did not make it through the extinction event 66 million years ago – but some of the early birds who had lived alongside them did. And they evolved into the birds alive today. Think of that: to see a dinosaur, all you need do is glance skyward.

   Could dinosaurs still exist somewhere in the world? A paleontologist

   theconversation.com/could-dinosaurs-still-exist-somewhere-in-the-world-a-paleontologist-explains-233967

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   Why did avian dinosaurs decline before asteroid impact?

   • The latter is likely due to hadrosaurs outcompeting other herbivores. We also estimate that extinction risk is related to species age during the decline, suggesting a lack of evolutionary novelty or adaptation to changing environments. These results support an environmentally driven decline of non-avian dinosaurs well before the asteroid impact.

   Dinosaur biodiversity declined well before the asteroid impact

   www.nature.com/articles/s41467-021-23754-0

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   How did dinosaurs survive 66 million years ago?

   • Paleontologists now agree that many if not all dinosaurs maintained constant high body temperatures, just like birds and mammals do today. Feathers kept them warm. Birdlike dinosaurs did not make it through the extinction event 66 million years ago – but some of the early birds who had lived alongside them did.

   Could dinosaurs still exist somewhere in the world? A paleontologist

   theconversation.com/could-dinosaurs-still-exist-somewhere-in-the-world-a-paleontologist-explains-233967

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3. science.howstuffworks.com › science-vs-mythAre Dinosaurs Still Alive? - HowStuffWorks

   science.howstuffworks.com › science-vs-myth

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   Nov 16, 2023 · Why are there no non-avian dinosaurs alive today? The non-avian dinosaur part of the evolutionary tree went extinct about 66 million years ago, likely due to a catastrophic event such as an asteroid impact, leaving no real dinosaurs alive today except for their bird descendants.

   • Birds and theropod dinosaurs share several evolutionary traits, such as feathers, a similar skeletal structure and, based on fossil evidence, certa...
   • The evidence comes from fossils that show gradual evolution such as the development of feathers, changes in bone structure, and the Archaeopteryx t...
   • The Cretaceous period was the last part of the age of dinosaurs, during which the first true birds evolved, leading to the diverse species we see t...

4. www.nature.com › articles › s41559/024/02427-3Jury remains out on decline of non-avian dinosaurs | Nature ...

   www.nature.com › articles › s41559/024/02427-3

   May 14, 2024 · In recent years there has been considerable interest in determining whether dinosaurs were in decline in the run up to the asteroid impact that probably caused their mass extinction at the end of...

   • Author: Luíseach Nic Eoin

   • Email: luiseach.niceoin@nature.com

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6. www.nhm.ac.uk › discover › newsDinosaurs were not in decline before the asteroid wiped them out

   www.nhm.ac.uk › discover › news

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   Nov 18, 2020 · New research suggests that the dinosaurs were doing well, and in some cases even flourishing, before they were wiped out by an asteroid. It goes against earlier suggestions that the non-avian dinosaurs were already on the decline and heading towards extinction when an asteroid hit Earth 66 million years ago. When the asteroid hit the Earth at ...

7. www.nature.com › articles › s41467/021/23754-0Dinosaur biodiversity declined well before the asteroid ...

   www.nature.com › articles › s41467/021/23754-0

   Jun 29, 2021 · The question why non-avian dinosaurs went extinct 66 million years ago (Ma) remains unresolved because of the coarseness of the fossil record. A sudden extinction caused by an asteroid is the...

   • Author: Fabien L Condamine, Guillaume Guinot, Michael J Benton, Philip J Currie

   • Publish Year: 2021

8. en.wikipedia.org › wiki › Cretaceous–PaleogeneCretaceous–Paleogene extinction event - Wikipedia

   en.wikipedia.org › wiki › Cretaceous–Paleogene

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   The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the K–T extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2][3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.

9. theconversation.com › could-dinosaurs-still-existCould dinosaurs still exist somewhere in the world? A ...

   theconversation.com › could-dinosaurs-still-exist

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   Aug 12, 2024 · It’s fun to imagine secret dinosaur survivors living today, hidden in a remote corner of Earth. But the truth of who made it through the extinction event 66 million years ago may surprise you.

10. www.bbc.com › future › articleWhat if dinosaurs hadn’t died out? - BBC

    www.bbc.com › future › article

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    Sep 18, 2017 · The so-called ‘non-avian’ dinosaurs didn’t have a hope, and only the small, feathered flying dinosaurs we know today as birds would make it through. Just as our ancestors had to deal with...