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Do you think there are more kinds of extinct dinosaurs that have never been found?
The Hall of Saurischian Dinosaurs.
The Museum's Hall of Saurischian Dinosaurs, with Apatosaurus on the left.

Yes! Every few weeks somebody describes a new one. We just described one. When an unknown dinosaur is found we write a detailed report on what we have discovered. This report is know as a 'description.' Paleontologists usually name the dinosaur in their description. Certainly on our next field trip we'll find a new one. There are many more dinosaurs waiting to be found than have been found. A lot of these have been collected and are in museum collections—they just haven't been studied yet.