page_title: Struthionidae
section_title: Evolution
hierarchical_section_title: Struthionidae / Evolution
caption_attribution_description: English: Male and female ostrich in Ngorongoro Deutsch: Männlicher und weiblicher Afrikanischer Strauß in Ngorongoro
context_page_description: Struthionidae is a family of flightless birds, containing the extant ostriches and their extinct relatives. The two extant species of ostrich are the common ostrich and Somali ostrich, both in the genus Struthio, which also contains several species known from Holocene fossils such as the Asian ostrich. The common ostrich is the more widespread of the two living species, and is the largest living bird species. Other ostriches are also among the largest bird species ever.
  Ostriches first appeared during the Miocene epoch, though various Paleocene, Eocene, and Oligocene fossils may also belong to the family. Ostriches are classified in the ratite group of birds, all extant species of which are flightless, including the kiwis, emus, and rheas. Traditionally, the order Struthioniformes contained all the ratites. However, recent genetic analysis has found that the group is not monophyletic, as it is paraphyletic with respect to the tinamous, so the ostriches are usually classified as the only members of the order, though the IUCN uses a broader classification and includes all "ratites" and tinamous in Struthioniformes.
context_section_description: The earliest fossils of ostrich-like birds are Paleocene taxa from Europe. Palaeotis and Remiornis from the Middle Eocene and unspecified ratite remains are known from the Eocene and Oligocene of Europe and Africa. These may have been early relatives of the ostriches, but their status is questionable, and they may in fact represent multiple lineages of flightless paleognaths. The African Eremopezus, when not considered a basal secretarybird or shoebill, is sometimes considered an ostrich relative or an "aepyornithid-like" taxon. Apart from these enigmatic birds, the fossil record of the ostriches continues with several species of the modern genus Struthio, which are known from the Early Miocene onwards.  Several of these fossil forms are ichnotaxa (that is, classified according to the organism's footprints or other trace rather than its body) and their association with those described from distinctive bones is contentious and in need of revision pending more good material.
  While the relationship of the African fossil species is comparatively straightforward, many Asian species of ostriches have been described from fragmentary remains, and their interrelationships and how they relate to the African ostriches are confusing. In China, ostriches are known to have become extinct only around or even after the end of the last ice age; images of ostriches have been found there on prehistoric pottery and petroglyphs. Ostriches have co-existed with another lineage of flightless didactyl birds, the eogruids. Though Olson 1985 classified these birds as stem-ostriches, they are otherwise universally considered to be related to cranes, any similarities being the result of convergent evolution. Competition from ostriches has been suggested to have caused the extinction of the eogruids, though this has never been tested and both groups do co-exist in some sites.
  As with most other ratites, ostriches are believed to have developed flightlessness in the wake of the Cretaceous-Paleogene extinction event of about 66 Ma. The sudden absence of non-avian dinosaurs opened ecological niche space for large herbivorous animals and limited predatory threats, prompting volant ancestral paleognaths dispersed across the southern hemisphere to convergently lose the capability for flight.
caption: Struthio camelus massaicus, female (left) and male (right)
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