Learning to Know Dinosaurs
Dinosaurus (Greek Δεινόσαυρος, deinosauros) are dominant vertebrate animals in land ecosystems for more than 160 million years, from the old trias period (about 230 million years ago) to the end of the lime period (about 65 million years ago), when many of them were extinct in the extinction of lime-test. Ten thousands of bird species that live now have been classified as Dinosaurus .
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