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Dana Carol

on 7 March 2014

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Transcript of Dinosaurs!

How do we know the dinosaurs were here?
How do we know that the dinosaurs were here if they're not here anymore? Paleontologists! These scientists study fossils so that they can teach about the the history of life on Earth!
There are two main kinds of dinosaurs - carnivores and herbivores. Carnivores eat meat and herbivores eat plants.
One of the smartest dinosaurs was Troodon (Troh-e-don). Its name means "Wounding Tooth" and it had one of the largest brains (relative to body size) of any of the dinosaurs.
How big were the dinosaurs?
Brachiosaurus was the heaviest dinosaur. They were 52 feet tall and weighed 80 tonnes. That's equal to the weight of 17 African elephants!
We know that all the different kinds of dinosaurs have names, but who was the first dinosaur to be named? It was Megalosaurus. It was named in 1824 by Reverend William Buckland. Megalosaurus means "great lizard" and it was about 30 feet long and 10 feet tall.
Over 700 different species of dinosaurs have been identified! Paleontologists (scientists who study dinosaurs) believe there are still many species left to be discovered.
Do you find dinosaurs exciting? So do scientists! Let's watch this science music video.
The most famous carnivore is Tyrannosaurus Rex.
The most famous herbivore is Brontosaurus.
Stegosaurus had the smallest brain of any of the dinosaurs. Their brains were about the size of walnuts.
How smart were the dinosaurs?
What kinds of dinosaurs were there?
How many kinds of dinosaurs were there?
The smallest dinosaur was Lesothosaurus, which was only the size of a chicken.
Why aren't the dinosaurs here anymore?
Dinosaurs are now extinct. This means there are no dinosaurs left on earth. How did this happen? Scientists believe that dinosaur extinction was brought about by two huge destructive events. One was Earth colliding with a meteorite. The other was a huge volcanic eruption.
How fast were the dinosaurs?
The fastest dinosaur was Dromiceiomimus, who could run up to 60 km/h.
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