Over a thousand dinosaur species once roamed the Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well as surprising facts about their extinction.
➡ Subscribe: http://bit.ly/NatGeoSubscribe
About National Geographic:
National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.
Get More National Geographic:
Official Site: http://bit.ly/NatGeoOfficialSite
Facebook: http://bit.ly/FBNatGeo
Twitter: http://bit.ly/NatGeoTwitter
Instagram: http://bit.ly/NatGeoInsta
Dinosaurs 101 | National Geographic
https://youtu.be/e5BFR-E-ae0
National Geographic
https://www.youtube.com/natgeo
(dramatic music)
(roaring) - [Narrator] Probably no
other creatures on the planet have struck as much fear
and awe in our hearts as the dinosaurs. (roaring) The earliest dinosaurs appeared
about 245 million years ago during the Triassic Period. When most of the Earth's
landmasses were still joined together as the super continent Pangaea. Over millions of years Pangaea split apart causing the dinosaurs to become separated for the very first time. This led the reptiles to adapt to their specific h
abitats and diversify. Giving rise to many new dinosaur species. According to some estimates, more than 1,000 species of
dinosaurs have roamed the Earth. All dinosaurs descended from
reptiles called Archosaurs. From there dinosaurs branched
out into two major groups, Saurischia and Ornithischia based on the shape and
orientation of their pelvis. In Saurischian dinosaurs, such as Tyrannosaurus
Rex and Brachiosaurus, the pelvis' pubis bone
faces forward and down. In Ornithischian dinosaurs, such a
s Stegosaurus and Hadrosaurs, the pubis bone faces backward and down. Across both groups, dinosaurs
varied greatly in size. Some were small, like Compsognathus, which was barely larger than a chicken. Where as others were
gigantic, like Dreadnoughtus, which was 85 feet long
and weighed 65 tons, making it the largest land
animal to have ever lived. Dinosaur diets varied as well. Herbivores, like Hadrosaurs, evolved to have specialized teeth for grinding tough plant material. Carnivores made up ro
ughly
40% of dinosaur species. Some predators, like
the raptor Deinonychus, even hunted in packs. (roaring) Social behaviors were also
found in other dinosaurs. Footprints and track ways indicate that some of the ancient
reptiles traveled together. Evidence also shows that herds
may have made annual visits to certain sites to lay their eggs. But by around 66 million years
ago, most dinosaurs died out. And the reason why is still a mystery. The most well known explanation
is an asteroid strike. B
ut a multitude of factors may have contributed to this extinction. In fact, the dinosaur population was already in severe decline by the time the asteroid struck. However, several dinosaur
species survived. And some of which evolved
to become today's birds. The world has never
again seen land creatures as great as the dinosaurs. But through their descendants
and fossils left behind, their legacy lives on.
Comments
Although dinosaurs have been gone for many years, their legacy lives on. What interests you the most about these fascinating creatures?
Mad respect to the cameraman who had to travel back in time to film all of this
National Geographic needs to do more dinosaur videos like this. This was a great video.
You know you've watched too many dinosaur documentaries when you've recognized every clip featured! 😂😅
I love Angeli Gabriel (producer and narrator of 101 series), her voice is so soothing and speaks eloquently.
I have always liked to search about the history of dinosaurs, I think they were incredible and fantastic creatures that inhabited the earth. It is very interesting to keep finding videos that show how they lived and how they became extinct.
Dinosaurs are without a doubt the coolest things to have ever lived.
First rate video, Nat Geo!! Great content as always!! As a dinosaur enthusiast I approve of this video!
This is amazing. Make this three hours longer please :)
Make more videos about dinosaurs, peoples in general only knows a few things like they were extinguished 65 million years ago, carnivore and herbivore and other but you ( national geographic team) need to go further than those well-known facts. By the way, I think you're the best magazine on the planet and maybe the most trailblazing society which ever existed thank you to give us knowledge and make us a little smarter every day :)
I think the extinction was bound to happen as the climate and landscape started to shift. The asteroid strike could probably be just the finisher. But... I'm no expert. Just an opinion. Good thing they don't exist anymore though. Would be challenging to co-exist without some sort of barrier. Thanks for sharing National Geographic.
Earth's greatest creatures that have ever lived🦖🦕🌴🌴🌿🌿🌳🌳🌿🌿🌿🍃🪨🌋
Great job, Nat Geo👍
Adoro esse canal da National Geographic!❤
Best channel in the universe is was and will Be NatGeo.Thanks for giving us so much knowledge......
Komodo dragon : I'm still alive, bichesss....
A really great video, thank you.
i'm just an 8 year old kid, but i read every single national geographic kids book!!!!!!!!
Great job nat geo!
Its amazing how these creatures actually lived