Question: How tall is a Struthio camelus?

full_context: Document 1: Genomic evolution of birds: Birds are the group of amniotes with the smallest genomes. Whereas mammal and reptilian genomes range between 1.0 and 8.2 giga base pairs (Gb), bird genomes have sizes between 0.91 Gb (black-chinned hummingbird, "Archilochus alexandri") and 1.3 Gb (common ostrich, "Struthio camelus"). Just as happens to any other living being, bird genomes’ reflect the action of natural selection upon these animals. Their genomes are the basis of their morphology and behaviour.
Document 2: Arabian ostrich: The Arabian ostrich or Syrian ostrich ("Struthio camelus syriacus") is an extinct subspecies of the ostrich that lived on the Arabian Peninsula and in the Near East until the mid-20th century.
Document 3: List of parrots: Parrots, also known as psittacines ( ), are the 402 species of birds that make up the order Psittaciformes, found in most tropical and subtropical regions, of which 387 are extant. The order is subdivided into three superfamilies: the Psittacoidea ("true" parrots), the Cacatuoidea (cockatoos), and the Strigopoidea (New Zealand parrots). Parrots have a generally pantropical distribution with several species inhabiting temperate regions in the Southern Hemisphere as well. The greatest diversity of parrots is in South America and Australasia.
Document 4: List of largest birds: The largest living bird, a member of the Struthioniformes, is the ostrich ("Struthio camelus"), from the plains of Africa and Arabia. A large male ostrich can reach a height of 2.8 m and weigh over 156 kg . A mass of 200 kg has been cited for the ostrich but no wild ostriches of this massive weight have been verified. Eggs laid by the ostrich can weigh 1.4 kg and are the largest eggs in the world today.
Document 5: North African ostrich: The North African ostrich or red-necked ostrich ("Struthio camelus camelus"), also known as the Barbary ostrich, is the nominate subspecies of the common ostrich from West and North Africa. It is the largest subspecies, making it the largest living bird.
Document 6: Diapsid: Diapsids ("two arches") are a group of amniote tetrapods that developed two holes (temporal fenestra) in each side of their skulls about 300 million years ago during the late Carboniferous period. The diapsids are extremely diverse, and include all crocodiles, lizards, snakes, tuatara, turtles, and dinosaurs (both avian and non-avian). Although some diapsids have lost either one hole (lizards), or both holes (snakes and turtles), or have a heavily restructured skull (modern birds), they are still classified as diapsids based on their ancestry. At least 7,925 species of diapsid reptiles exist in environments around the world today (nearly 18,000 when birds are included).
Document 7: Masai ostrich: The Masai ostrich ("Struthio camelus massaicus"), also known as the pink-necked ostrich or East African ostrich, is a large subspecies of the common ostrich native to East Africa. Today it is farmed for eggs, meat and feathers.
Document 8: Parrot: Parrots, also known as psittacines , are birds of the roughly 393 species in 92 genera that make up the order Psittaciformes, found in most tropical and subtropical regions. The order is subdivided into three superfamilies: the Psittacoidea ("true" parrots), the Cacatuoidea (cockatoos), and the Strigopoidea (New Zealand parrots). Parrots have a generally pantropical distribution with several species inhabiting temperate regions in the Southern Hemisphere, as well. The greatest diversity of parrots is in South America and Australasia.
Document 9: Flightless bird: Flightless birds are birds that through evolution lost the ability to fly. There are over 60 extant species including the well known ratites (ostrich, emu, cassowary, rhea and kiwi) and penguins. The smallest flightless bird is the Inaccessible Island rail (length 12.5 cm, weight 34.7 g). The largest (both heaviest and tallest) flightless bird, which is also the largest living bird, is the ostrich (2.7 m, 156 kg). Ostriches are farmed for their decorative feathers, meat and their skins, which are used to make leather.
Document 10: South African ostrich: The South African ostrich ("Struthio camelus australis"), also known as the black-necked ostrich, Cape ostrich or southern ostrich is a subspecies of the common ostrich endemic to Southern Africa. It is widely farmed for its meat, eggs and feathers.
Document 11: Pachyornis: Pachyornis is an extinct genus of ratites from New Zealand which belonged to the moa family. Like all ratites it was a member of the order Struthioniformes. The Struthioniformes are flightless birds with a sternum without a keel. They also have a distinctive palate. This genus contains three species, and are part of the Anomalopteryginae or lesser moa subfamily. "Pachyornis" moa were the stoutest and most heavy-legged genus of the family. The most notable species being "Pachyornis elephantopus" - the Heavy-Footed Moa. They were generally similar to the Eastern Moa or the Broad-billed moa of the genus "Euryapteryx", but differed in having a pointed bill and being more heavyset in general. At least one species ("P. australis") is assumed to have had a crest of long feathers on its head. The species became rapidly extinct following human colonization of New Zealand, with the possible exception of "P. australis", which may have already been extinct by then.
Document 12: Common ostrich: The ostrich or common ostrich ("Struthio camelus") is either one or two species of large flightless birds native to Africa, the only living member(s) of the genus "Struthio", which is in the ratite family. In 2014, the Somali ostrich ("Struthio molybdophanes") was recognized as a distinct species.
Document 13: Emu: The emu ("Dromaius novaehollandiae") is the second-largest living bird by height, after its ratite relative, the ostrich. It is endemic to Australia where it is the largest native bird and the only extant member of the genus "Dromaius". The emu's range covers most of mainland Australia, but the Tasmanian emu and King Island emu subspecies became extinct after the European settlement of Australia in 1788. The bird is sufficiently common for it to be rated as a least-concern species by the International Union for Conservation of Nature.
Document 14: Lists of endemic birds: This is a master list pertaining to lists of endemic birds. As applied to birds, the term "endemic" refers to any species found only within a defined geographical area. There is no upper limit for the area; it would not be incorrect to refer to all bird species as endemic to Earth. In practice, the largest areas for which the term is in common use are countries and geographical regions. An Endemic Bird Area (EBA), a term devised by BirdLife International, is a geographical (rather than political) region of the world that contains two or more restricted-range (of no more than 50,000 km) species, while a "secondary area" contains one restricted-range species.
Document 15: Bird: Birds (Aves) are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5 cm bee hummingbird to the 2.75 m ostrich. They rank as the class of tetrapods with the most living species, at approximately ten thousand, with more than half of these being passerines, sometimes known as perching birds. Birds are the closest living relatives of crocodilians. Birds are descendants of extinct dinosaurs with feathers, making them the only surviving dinosaurs according to cladistics.
ground_truth: 2.75 m