have established feral populations.

Taxonomy

In 2019, the species S. pannonicus, S. dmanisensis (the giant ostrich), and S. transcaucasicus were transferred to the genus Pachystruthio.

Order Struthioniformes Latham 1790 (ostriches)
* Family Struthionidae Vigors 1825
** Genus +Orientornis Wang 2008 (Late Miocene)
** Genus +Pachystruthio

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