Who has not heard about dinosaurs? These are the prehistoric reptiles, which are commonly named as "dinosaur". The dinosaurs lived 65 million years ago, which is a way long throwback. These were the mammals and not the ones like today. These were the big gigantic huge mammals with a lot of species.
After a few years of existence, it got extinct! But why? The evidence state that many years ago an asteroid from the space came over that vanishes all of sudden. It hit the planet with an explosion and the gas out of it made the dinosaur extinct. But it is certain that not all of them died of that explosion. There were some that got saved, but hunger killed them.
Moreover, it is stated that there was a volcano eruption that made a climatic change all of a sudden and in which the survived dinosaur failed to survive and died. It is still stated that some of the dinosaurs are still alive but there is no evidence of it.
On the other hand, Tyrannosaurus, Velociraptor, Apatosaurus, Stegosaurus, or Triceratops are some of the birds that are lived. And these are taken as the family of the dinosaur. But still, there is no proof that the dinosaurs are alive.
In a nutshell, it is the asteroid that made dinosaurs extinct. Other than the asteroid it is the volcano eruption and climatic changes that lead to the extinction of the dinosaurs. Today, there is no evidence that they are alive!