Dinosaurs 101 | National Geographic

(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 habitats 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 as 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 roughly
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. But 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.

99 thoughts on “Dinosaurs 101 | National Geographic”

  1. Although dinosaurs have been gone for many years, their legacy lives on. What interests you the most about these fascinating creatures?

  2. I like the fact that the tendon in one t-rex ankle to foot is more than all the tendons in the body of a rinoserus put together.

  3. Why do I feel like the title of heaviest dinosaur changes every time I look it up? I've seen like 6 different species claiming it, at least what stays consistent is that it's always a sauropod from Argentina. So it's Dreadnoughtus now?

  4. as soon I heard the trike roar the JP tree roar which was the first thing in the video I immediately stopped taking the video seriously

  5. Dinosaurs here:
    Tyrannosaurus Rex

  6. Ok, so first, Dreadnoughtus was NOT the biggest land animal ever to roam the earth. Argentinosaurus, Puertasaurus, Patagotitan ever heard of these guys? And second, how are 65 tons 907 kg. National Geographic you disappoint me…

  7. God created all animals in the first week of creation including the dinosaurs.Not by some false system call Darwinian evolution.Its all back in Genesis! Take care.

  8. It just somehow came to my mind what if we will have the same fate as the dinosaurs have we all die in a asteroid strike and our bones will be buried down after that species way more intelligent than us would discover our remains and evidences about us but we will have a bad reputation to them for starting wars, fighting over oil, crimes and etc.

  9. Chicxulub:I found other base to live
    Earth:who found nearby me?
    Dinosaurs:who is that creepy rock?
    a few minutes later
    Dinosaurs:*burned to death*

  10. May be the extinction was happened because of airborne virus which affects only dinosaur's genes/chromosome.

  11. How do we know what sounds dinosaurs made. For all I know , they could be singing opera when they roar

  12. Bible says Dinosaurs and Human are same live God create human the place that no Dinosaurs
    Dinosaur extinction is because the Flood of Noah

  13. A lot of this information is outdated a lot in paleontology has changed a lot in the last years. And there are not enough feathers on some Dinosaurs and a lot of these reconstructions are outdated!!! I can't believe this. This is made by national geographic. This channel should be in every aspect scientific accrute

  14. Birds are essentially dinosaurs, so I always wondered why did birds survive whatever cataclysmic event wiped out the other dinosaurs?

  15. There are a number of dinosaurs that have now been found to be much bigger that dreadnoughtus, in length and weight; Argentinosaurus, Puertasaurus and Patagotitan are three dinosaurs that have been found in South America. Paleontologists believe they were still growing at the time of their deaths.

  16. Just remember

    There are no proofs that dinosaurs actually roared. Hope I didn't ruin your childhood👍😂👍

  17. 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 🙂

  18. Dinosaurs where never real they are fake the Bible tells you about every animal God made and it doe not included dinosaurs

  19. Amazing video it will impress my science teacher you are the best and I will subscribe you so that I get some knowledge about early creaches a special thanks to you you for this amazing video👍👍👍👍👍👍👍👍👌👌👌👌👌👌👌👌👌👌

  20. Nat Geo: Dinosaurs are split into 2 groups, Saurischia and Ornithischia, based on their pelvis.

    Ornithoscelida: I’m about to end this guy’s whole career.

  21. Is there a Dinosaurs 201? This is an accessible video that provides the dinosaur basics that almost nobody who isn’t in the field or a hobbyist knows. It’s a great video.

  22. "their legacy lives on" scientists, "hey, lets create an biological agency and bring the dinosaur back to life"
    (Legacy upgraded to lv 10)

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