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Dinosaur Facts
Scientists can figure out what a dinosaur ate by looking closely at its teeth. Dinosaurs that ate meat had sharp, pointed teeth needed to tear their food apart. Those with blunt teeth fed mostly on plants.
All dinosaurs laid eggs. The covered them with soil. The eggs stayed warm until they cracked and the babies crawled out. The largest eggs were almost a foot and a half long. After the eggs hatched, it appears that some babies stayed in the nest until they were three feet long. And some grew to full size by the age of eight.
When the first dinosaur fossils were found 170 years ago, some people did not believe that such giant creatures ever existed. Dinosaurs were special kinds of reptiles. It is possible that emus, ostriches, and even birds that fly are their distant cousins. Pteranodons, giant flying reptiles that lived at the same time, were not true dinosaurs.
Apatosaurus was the size of a moving van. It ate all the time. Brachiosaurus was probably the tallest and heaviest dinosaur. Its rib is almost 10 feet long. If Seismosaurus were alive today it could stretch the distance between first and third base of a baseball diamond. But not all dinosaurs were giants. Compsognathus was the size of a chicken. And it could dash around on two legs like one, tracking down small lizards and insects.
The last dinosaurs disappeared about 65 million years ago. No one knows exactly why. Most likely the climated changed too much for them. Other theories are related to volcanic debris blocking out the sunlight, a giant meteorite striking the and destroying the ozone layer, or a very deadly disease that killed all of them.
What sounds did dinosaurs make? Nobody knows for sure, but Parasaurolophus had a long hollow tube in its crest that it probably used to make a sound like a horn.
The Triceratops existed 136,000,000 years ago and lived for 71,000,000 years in the North American region. They grew as long as 30 feet, and weighed up to 5 tons and were plant eaters. The Triceratops was one of the last dinosaurs to evolve and also one of the last to become extinct.
Triceratops, or "Three-Horned Face", used its two horns and narrow, hooked beak in defense against its predators.
Fossilized footprints suggest that horned dinosaurs, also known as Ceratopsians may have lived in herds.
The Triceratops' brain was twice as large as that of the Tyrannosaurus.
Maiasaura parents pre-chewed food for the young because the babies' bones were to soft to permit them from leaving the nest.
Velociraptor was about as tall and fast as a large dog and only as smart as an ostrich.
Amargasaurus was a big plant eater that lived in the area now known as Argentina. It had a double row of bony spines down its back, the purpose of which is unclear.
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