About 65 million years ago.
because they all died?
of course we wont were awesome
Harry and His Bucket Full of Dinosaurs - 2005 I Wish It Would Stop Raining is rated/received certificates of: Australia:G
$17.99
Why dinosaurs were so big is because in prehistoric times there was no winter. and dinosaurs are lizards and lizards never stop growing. so mixed with humidity and surplus of food the dinosaurs or lizards lived for hundreds of years and grow all that time.
noone is sure even scientists but there's alot because dinosaurs + existing animals + extinct animals = alottt
Dinosaurs are reconstructed from fossils, petrified remains, trace fossils, and comparisons with existing animals.
Humans never existed with the Dinosaurs. While the dinosaurs lived the largest mammals were about the size of modern rats and were mostly nocturnal (active while the dinosaurs slept). It was not until all of the dinosaurs had died that mammals could risk coming out of hiding during the daytime. The dinosaurs had been dead for about 10 million years before the first primates evolved, and humans evolved from primates about 54 million years after that (dinosaurs had been dead roughly 64 million years before the first humans lived).
Some Dinosaurs (If that is what you are referring to) do still exist on Earth. Some Animals, Such as Alligators, Crocodiles, Komodo Dragons, and even Chickens are Dinosaurs! But there has been some recent evidence of the Tyrannosaurus Rex still existing today.
Science doesn't really work like that; but there is good evidence that a major asteroid impact happened shortly before the mass extinction of the dinosaurs. To complicate the story slightly, the dinosaurs had been declining before the asteroid hit - so it may be the asteroid may have speeded an existing process. There is also good evidence that modern birds are descended from dinosaurs.
you could stop breathing
Alligators and Crocodiles lived in prehistoric times, however are not considered proper dinosaurs. Most prehistoric creatures were made extinct many years ago.