00:00The End
00:52Millions of years ago, huge reptiles called dinosaurs roamed the Earth.
00:58The name dinosaur means terrible lizard.
01:04Dinosaurs appeared some 220 million years ago and roamed the Earth until about 65 million
01:11years ago.
01:12We know they were here because their bones have been found on every continent.
01:17Each dot indicates the location where fossils have been found.
01:22Let's take a look at the history of life on Earth.
01:26Life began in the ocean about 3.35 billion years ago.
01:34After the fish, the amphibians appeared.
01:39Reptiles, including the dinosaurs, came next.
01:45Mammals appeared later.
01:48And birds appeared last.
01:55Humans have been on Earth for only about a million years.
02:04Some dinosaurs were enormous and grew as tall as houses.
02:10They could be as long as 15 elephants and weigh as much as 12 automobiles.
02:19Brontosaurus was one of the largest dinosaurs.
02:25When he walked, his footsteps must have sounded like thunder.
02:28In fact, his name means thunder lizard.
02:38Like most reptiles, Brontosaurus reproduced by laying eggs.
02:48He was a harmless animal.
02:50He only ate plants.
02:55Not all dinosaurs were big.
02:58Some were no bigger than chickens.
03:18Sylophysis was a flesh eater about eight feet long.
03:39The plant-eating dinosaurs protected themselves in different ways.
03:49Stegosaurus had bony plates on his back and spikes on his tail.
04:00His name means plated lizard.
04:17Anathosaurus, the duck lizard, escaped into the water in times of danger.
04:25He had webbed feet to help him swim.
04:35His jaws contained hundreds of tightly packed teeth for crushing tough planks.
04:45Other duck-filled dinosaurs and odd-looking crests decorating their heads.
04:57The flying reptiles seen in the background are pteranodons.
05:03Pteranodons are reptiles, but not related to the dinosaurs.
05:10The ankylosaurus was a living tank.
05:14Ankylosaurus means stiffened lizard.
05:17His back was tough armor.
05:20Despite their protective armors, not many dinosaurs could escape the sharp teeth of Tyrannosaurus rex.
05:29His name means king tyrant lizard, and he was a ferocious beast.
05:37Tyrannosaurus grew to be 50 feet long and 18 feet tall.
05:44The horned-faced dinosaurs didn't fear Tyrannosaurus rex because they had horns to defend themselves.
05:54Triceratops was the largest of this group.
06:00Triceratops means three-horned face.
06:13Monoclonius had only one horn.
06:15His name means single-stem lizard.
06:21The horned-faced dinosaurs were plant-eaters.
06:27All of them had horny beaks and frills or spikes in the back of their heads.
06:49Styracosaurus did not hesitate to fight Tyrannosaurus rex when necessary.
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06:59Please!
07:37The End
08:03Dinosaurs ruled the Earth for 140 million years.
08:10As centuries passed, some dinosaurs died, while others continued to survive.
08:1865 million years ago, the last of the dinosaurs disappeared.
08:28At that time, changes occurred in the climate, affecting the dominant types of vegetation.
08:35The dinosaurs could not retreat to a warmer climate, as the northern and southern landmasses were separated by tropical seas.
08:44Today, the bones of dinosaurs may be seen in many museums, where they give us a window into the geological
08:52past.
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