Ancient Greek ὄρνις (ornis, “bird”) + ἰσχίον (iskhion, “hip joint”).
"ornithischia." YourDictionary, n.d. Web. 14 January 2019. <https://www.yourdictionary.com/Ornithischia>.
ornithischia. (n.d.). Retrieved January 14th, 2019, from https://www.yourdictionary.com/Ornithischia
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