Article: Dozens of dinos.(dinosaurs)

Millions of years ago, dinosaurs ruled Earth. It was so long ago that there were no humans, no cats, and no dogs. Dinosaurs came in all shapes and sizes. They lived almost everywhere--in fact, their fossils have been found on every continent.

Depending on whom you ask, between 400 and 600 different dinosaurs have been discovered and named. That's between 33 and 50 dozen dinos!

Argentinosaurus might have been the biggest animal that ever lived on land. It's possible it grew to be 120 feet long, or as long as three school buses. It could have weighed 100 tons, or as much as 20 elephants. Argentinosaurus's bones have been found in South America.

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