Ancient Greek ὄρνις (ornis, “bird”) + ἰσχίον (iskhion, “hip joint”).
"ornithischia." YourDictionary, n.d. Web. 19 September 2018. <http://www.yourdictionary.com/ornithischia>.
ornithischia. (n.d.). Retrieved September 19th, 2018, from http://www.yourdictionary.com/ornithischia
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