Ratites (/ˈrætaɪts/) are a polyphyletic group consisting of all birds within the infraclass Palaeognathae that lack keels and cannot fly. They are mostly...

This is a list of ratites. Extinct (EX) – No known living individuals Extinct in the wild (EW) – Known only to survive in captivity, or as a naturalized...

ability to fly. There are over 60 extant species, including the well-known ratites (ostriches, emus, cassowaries, rheas, and kiwis) and penguins. The smallest...

infra-class Palaeognathae, a diverse group of flightless birds also known as ratites that includes the emus, rheas, cassowaries, kiwis and the extinct elephant...

representatives are often known as ratites), and their closest living relatives are kiwi (found only in New Zealand), suggesting that ratites did not diversify by vicariance...

extant orders of flightless lineages (plus two that are extinct), termed ratites, and one flying lineage, the Neotropic tinamous. There are 47 species of...

sister group to ratites. The nine species of moa were the only wingless birds, lacking even the vestigial wings that all other ratites have. They were...

(/ˈæptərɪks/). Approximately the size of a domestic chicken, kiwi are the smallest ratites (which also include ostriches, emus, rheas, cassowaries and the extinct...

Elephant bird was a ratite; it could not fly, and its breast bone had no keel. Because Madagascar and Africa separated before the ratite lineage arose, Aepyornis...

the genus Casuarius in the order Casuariiformes. They are classified as ratites: flightless birds without a keel on their sternum bones. Cassowaries are...

Rheidae /ˈriːɪdiː/ is a family of flightless ratite birds which first appeared in the Paleocene. It is today represented by the sole living genus Rhea...

cassowary, alongside the dwarf cassowary and the northern cassowary. It is a ratite and therefore related to the emu, ostrich, rhea and kiwi. The Australian...

regarded as the sister group of the flightless ratites, but recent work places them well within the ratite radiation as most closely related to the extinct...

Struthio kakesiensis is an extinct oospecies of ratite bird known from eggshell fossils found in Laetoli, Tanzania. It was related to the modern day Struthio...

and ratite birds. Eucalypts are the predominant trees in much of Australia and New Guinea. New Zealand has no native land mammals, but also had ratite birds...

the genus Dromaius and the third-tallest living bird after its African ratite relatives, the common ostrich and Somali ostrich. The emu's native ranges...

species that many have lost the ability to fly. This has occurred in several ratites including the kiwi and the cassowary as well as in the dodo and the kākāpō...

Multituberculates and the first rodents widespread. First large birds (e.g. ratites and terror birds) and mammals (up to bear or small hippo size). Alpine...

Panbiogeographic tracks of the ratite birds, the southern beech Nothofagus, and the New Zealand frog Leiopelma...

The moa were large, flightless birds with a sternum, but without a keel: ratites. They also had a distinctive jaw and palate. The origin of these birds...

Struthio wimani is an extinct species of ratite bird from the Pliocene of China. Zicha, Ondrej (1999) beautyofbirds.com (2010) beautyofbirds.com (2010)...

the Antarctic peninsula, Ratites may have similarly traveled overland from South America to colonise Australia; a fossil ratite is known from Antarctica...

Sibley–Ahlquist orders are as follows: Enlarged Struthioniformes replaces the ratite orders Rheiformes (rheas), Casuariiformes (cassowaries and emus), and Apterygiformes...

both of the sexes.[citation needed] Certain bird species, such as the ratites, screamers, waterfowl, and cracids (a family of arboreal galliformes) exhibit...

Dromaius (from greek δρομαίυς "runner") is a genus of ratite present in Australia. There is one extant species, Dromaius novaehollandiae, commonly known...

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...

Central and South America) and the ratites, which nowadays are found almost exclusively in the Southern Hemisphere. The ratites are large flightless birds, and...

surviving lineages of neornithine birds, including the ancestors of modern ratites, ducks and chickens, and a variety of waterbirds, diversified rapidly at...

x. Handbook of Australian, New Zealand and Antarctic Birds. Volume 1, Ratites to Ducks. Marchant, S.; Higgins, P.J. (Coordinators). Melbourne, Victoria:...

species of ostriches, the only living members of the genus Struthio in the ratite order of birds. The other is the Somali ostrich (Struthio molybdophanes)...