DINOSAUR FAQ What is a dinosaur? What does the word "dinosaur" mean? Where did dinosaurs live? When did dinosaurs live? If I find what I think is a dinosaur bone, what do I do? What are the best sources of information about dinosaurs? How many dinosaurs were there? Why were dinosaurs so big? What was the "biggest" dinosaur? Are dinosaurs extinct? 10. Are dinosaurs extinct? Yes and no. All the dinosaur species that lived during the Mesozoic Era are extinct. And all of the "traditional" dinosaurs (meaning all the dinosaurs that aren't birds) are extinct. Seven of the eight major groups of dinosaurs are extinct, leaving only the theropod dinosaurs (see above). One of 40+ subgroups of theropod dinosaurs evolved into birds, so that one major group is not extinct. You can say that dinosaurs are 7/8 extinct!
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