The first dinosaur walked the earth in the triassic period, 230 million years ago. Scientists first began studying dinosaurs since the 1820's when they found bones of a land reptile called the Megalosaurus, big lizzard. Scientists have two thoughts on how dinosaurs could have become extinct. One way is that an asteroid or comet could have wiped the whole population or a huge volcanic eruption killed these creatures.
There are many types of dinosaurs that have existed. Scientists have dicovered around 540 kinds but they have said that there are still 700 to 900 more species to find.
How Dinosaurs Eat
About Me... My name is Noelle and I like dinosaurs. I'm athletic and I like to play basketball.