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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 .
The Somali ostrich occurs in the Horn of Africa, having evolved isolated from the common ostrich by the geographic barrier of the East African Rift. In some areas, the common ostrich's Masai subspecies occurs alongside the Somali ostrich, but they are kept from interbreeding by behavioral and ecological differences. [15]
The early records that ranged from the Pliocene Epoch in Africa to the Pleistocene-Holocene Epoch in northeastern Asia are considered dubious. [2] Beads made from shells taken from archaeological sites in India dating to more than 25,000 years were found to have traces of DNA and analysis of sequences examined from them show that the species is definitely in the genus Struthio.
Darwin wrote "Speculate on neutral ground of 2 ostriches; bigger one encroaches on smaller. change not progressif<e>: produced at one blow. if one species altered", proposing a sudden change or saltation in contrast to Lamarck's idea that species graded imperceptibly into each other: later, Darwin referred to this jump as inosculation.
Struthioniformes is an order of birds with only a single extant family, Struthionidae, containing the ostriches.Several other extinct families are known, spanning across the Northern Hemisphere, from the Early Eocene to the early Pliocene, including a variety of flightless forms like the Paleotidae, Geranoididae, Eogruidae and Ergilornithidae, the latter two thought to be closely related to ...
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The North African ostrich, [1] red-necked ostrich, or Barbary ostrich (Struthio camelus camelus) is the nominate subspecies of the common ostrich from West and North Africa. It has the largest average size among the subspecies of ostriches, making it the largest living bird .
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