Ancient Greek ὄρνις (ornis, “bird”) + ἰσχίον (iskhion, “hip joint”).
"ornithischia." YourDictionary, n.d. Web. 14 November 2018. <https://www.yourdictionary.com/ornithischia>.
ornithischia. (n.d.). Retrieved November 14th, 2018, from https://www.yourdictionary.com/ornithischia
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