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extant oligocene first appearance(noun, animal, geohistory, appearance)
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APASmart Define. (1970). Passeroidea thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/passeroidea/thesaurus/broader
ChicagoSmart Define. 1970. "Passeroidea thesaurus" https://smartdefine.org/passeroidea/thesaurus/broader (accessed September 25, 2026).
HarvardSmart Define 1970, Passeroidea thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/passeroidea/thesaurus/broader>.
MLASmart Define. "Passeroidea thesaurus" 1 January 1970. Web. 25 September 2026. <https://smartdefine.org/passeroidea/thesaurus/broader>