(suspenseful music)
(water gurgling) – [Narrator] During the Cretaceous period, Mosasaurs were among
the oceans most fearsome and successful predators. Mosasaurs were marine reptiles
that are thought to be closely related to snakes
and monitor lizards. They were highly adaptable and many different species evolved and came to dominate
ocean habitats worldwide. Some even took to fresh
water rivers to hunt. Many prowled the open ocean,
devouring fish, sharks, plesiosaurs, sea turtles, sea birds, and sometimes even smaller mosasaurs. Mosasaur size varied greatly. Two of the largest mosasaurs
were Mosasaurus and Tylosaurus. Each stretched 30 to 50
feet, longer than a T-Rex. Meanwhile, many smaller mosasaurs were no larger than a dolphin. Yet most species, no
matter how large or small, could be characterized
by a long serpentine body with a powerful tail which
they moved side to side as they slithered through the water. They had paddles that were
likely used for stability and large heads that had
powerful, flexible jaws. Their jaws contained two
rows of conical teeth, designed to chomp and hold prey
before swallowing it whole. The top marine reptiles since the Triassic had been ichthyosaurs and plesiosaurs, but they were in decline when mosasaurs came onto the
scene during the Cretaceous, leaving room for a new apex predator. According to theory, mosasaurs evolved from terrestrial lizards
that adapted to the oceans by the middle of the Cretaceous. Then, during the 20 to 30 million years leading up to the
extinction of the dinosaurs, mosasaurs rapidly adapted to
ocean habitats the world over. We know this because
fossils have been found on every continent, including Antarctica. When dinosaurs became extinct some 65 and a half million years ago, mosasaurs vanished from
the fossil record as well. While it’s not known whether they died off
instantly or gradually, one thing is for certain: the ocean has never again
seen marine reptiles as massive and as great as mosasaurs. (gentle cinematic music)

Author Since: Mar 11, 2019

  1. Ah….shame there’s so many inaccuracies, especially coming from a scientific channel. But the cringe in the comments section is a little worse….

  2. Evolution is the only explanation of life that gives voilition a facet of adaptation, allowing species to modulate their behavior according to the environmental cues of the time as in Mausosaurus, the iguana of the Cretaceous. ….

  3. I'm from Colombia and during the Cretaceous period, most of my country was underwater, we are blessed with great fossil record of Marine reptiles, in Villa de Leyva there are great museums I'm so lucky to been there, these creatures are amazing

  4. Some mosasaurs were larger than a T-rex, with the smaller ones being about the size of a dolphin. What intrigues you the most about these great marine reptiles?

  5. so what kind of effect did the giant meteor that hit earth have on the ocean specifically? did the oceans cool a bunch because of the cloud of ash blocking the sky?

  6. i would like to see a version of lion king for mosasaurs. And then mufasa mosasaur eating simba mosasaur with the circle of life playing on the background.

  7. What puzzles me is, why did they die off along with the dinosaurs? The asteroid collision is said to have destroyed the dinosaurs, but these creatures lived in the sea. Did that not give them any protection?

  8. Amazing 🌏🌎🌍 is alive and will never stop leaning discover understanding WHY WHY going to the futures.👍☯👍☯👍☯✌☯✌

  9. It was found on every continent because there was only one continent back then. The land split into separate parts throughout millions of years FYI…

  10. Paleozoic: Fishes Rule (Some Become Amphibians as they out of water and The rest Stay.)
    Mesozoic: Reptiles Rule (Mosasaurus became the one of the Reptiles alongside Plesiosaurus and Pliosaurus also icthyosaurus where they living in water with fin like Limbs, but they died due to a Meteor Crashing in between Cretaceous & Tertiary. )
    Cenozoic: Mammals Rule (Like Reptiles, Mammals Breathe air and the mammals became the Next after Reptiles to Dwells in Oceans.
    Despite surviving from Attack of the Superpredator Megalodon, The Sea Mammals must have to survive the Recent mass extinction began since Quarternary, because WE were doing it.)

  11. Largest known large-bodied predator to ever exist. Megalodon was likely stubbier than its modern counterparts so it may very well have been much smaller than mosasaurs.

  12. You don't know what happened to MH370 which was 4 years ago, so how can you know what happened million years ago?
    I will never believe revolution because it is not logic and it's not scientifically proven.

  13. But they say we have yet to discover what's left in the sea, so who knows if they really are extinct? but then again, it's been millions years ago …

  14. Do any of you know videos/documentaries where scientists actually explain how they predict the behaviors of extinct creatures? Or how they know the skin types and body shape from fossils?

  15. Extinct marine gigantic lizards. (I don't know if I would still love swimming in the ocean knowing if this extinct animals are still there deep down the sea).

  16. اعتقد انه قد حان وقت التفكير بإعادة تدوير الارض وتعقيمها من المخلوقات الضاره ليعيش الانسان بسلام أينما ذهب وكان

  17. Water Dragons/ Sea Serpents , seen for thousand of years out at sea by maby sailor alike…. these creatures were around much recently and may still be

  18. Aren't sharks fish? Being a little redundant. Plus their paddles were used for stability, more like for quick propulsion.

  19. Amazing how a movie, turned mosa in to a real popular guy. Now every game movie or documental. Must have a mosa.

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