
Coelurosauria ə (from Greek, meaning `hollow tailed lizards`) is the clade containing all theropod dinosaurs more closely related to birds than to carnosaurs. Coelurosauria is a subgroup of theropod dinosaurs that includes compsognathids, tyrannosaurs, ornithomimosaurs, and maniraptorans; Maniraptora includes birds, the only dinosaur group aliv.....
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http://en.wikipedia.org/wiki/Coelurosauria

Coelurosauria These are hollow-tailed lizards from Jurassic through Cretaceous periods and are closely related to birds (and includes the birds).
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http://www.wordinfo.info/words/index/info/view_unit/2727/9
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