At the time of its discovery, Diplodocus was the longest dinosaur known.

There are something like three hundred genera of dinosaurs known so far.

Rather it showed that among the most birdlike dinosaurs known as coelurosaurs plant eating was a common way of life.

For many years, it was the longest dinosaur known.

It was one of the smallest dinosaurs known.

It is now among the dinosaurs best known to science: over 100 skeletons have been found, some of them nearly complete.

The oldest dinosaurs known are 230 million years old, and have been found in Madagascar.

Footprints of early bipedal dinosaurs known as Sphingopus, from 246 million years ago, were also found.

Their descriptions are similar to those of dinosaurs commonly known as raptors.

In fact, Diplodocus is the longest dinosaur known from a complete skeleton.