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This is a list of Struthioniformes species by global population. While numbers are estimates, they have been made by the experts in their fields. For more information on how these estimates were ascertained, see Wikipedia's articles on population biology and population ecology.
This list is not comprehensive, as not all extant Struthioniformes have been enumerated.
| Common name | Binomial name | Population | Status | Trend | Notes | Image |
|---|---|---|---|---|---|---|
| Little spotted kiwi | Apteryx owenii | 1,200 [1] | NT [1] |  [1] | Minimum estimate. [1] |  |
| Northern cassowary | Casuarius unappendiculatus | 3,500 – 15,000 [2] | LC [2] |  [2] |  | |
| Great spotted kiwi | Apteryx haastii | 8,000 [3] | VU [3] | [3] |  | |
| Southern cassowary | Casuarius casuarius | 10,000 – 19,999 [4] | LC [4] | [4] |  | |
| Common emu | Dromaius novaehollandiae | 630,000 - 725,000 [5] | LC [5] | [5] |  | |
| Southern brown kiwi | Apteryx australis | 29,800 [6] | VU [6] | [6] |  | |
| North Island brown kiwi | Apteryx mantelli | 35,000 [7] | VU [7] | [7] | Preliminary estimate. [7] |  |
The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological species. A series of Regional Red Lists, which assess the risk of extinction to species within a political management unit, are also produced by countries and organizations.
The southern cassowary, also known as double-wattled cassowary, Australian cassowary, or two-wattled cassowary, is a large flightless black bird, found in Indonesia, Papua New Guinea, and northeastern Australia. It is one of the three living species of cassowary, alongside the dwarf cassowary and the northern cassowary. It is a ratite and therefore related to the emu, ostriches, rheas and kiwi.
The North Island brown kiwi is a species of kiwi that is widespread in the northern two-thirds of the North Island of New Zealand and, with about 35,000 remaining, it is the most common kiwi. It holds the world record for laying the largest eggs relative to its body size.
The northern cassowary also known as the one-wattled cassowary, single-wattled cassowary, or golden-necked cassowary, is a large, stocky flightless bird of northern New Guinea. It is one of the three living species of cassowary, alongside the dwarf cassowary and the southern cassowary. It is a member of the superorder Paleognathae.
This is a collection of lists of mammal species by the estimated global population, divided by orders. Lists only exist for some orders; for example, the most diverse order - rodents - is missing. Much of the data in these lists were created by the International Union for Conservation of Nature (IUCN) Global Mammal Assessment Team, which consists of 1700 mammalogists from over 130 countries. They recognize 5488 species in the class.
