As of 2020, there are five species of birds that are considered extinct in the wild by the International Union for Conservation of Nature.
Socorro Island is a volcanic island in the Revillagigedo Islands, a Mexican possession lying 600 kilometres (370 mi) off the country's western coast. The size is 16.5 by 11.5 km, with an area of 132 km2 (51 sq mi). It is the largest of the four islands of the Revillagigedo Archipelago. The last eruption was in 1993.
The Alagoas curassow is a glossy-black, pheasant-like bird. It was formerly found in forests in Northeastern Brazil in what is now the states of Pernambuco and Alagoas, which is the origin of its common name. It is now extinct in the wild; there are about 130 individuals in captivity.
The Alagoas foliage-gleaner is an extinct passerine bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It was endemic to Brazil.
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as only consisting of living members kept in captivity or as a naturalized population outside its historic range. Classification requires exhaustive surveys conducted within the species' known habitat with consideration given to seasonality, time of day, and life cycle. Once a species is classified as EW, the only way for it to be downgraded is through reintroduction.
The Kauaʻi ʻamakihi is a species of Hawaiian honeycreepers endemic to Kauaʻi in the family Fringillidae. The species Hawaiian name is associated with is Kihikihi, or kihi, which stems from the word amakihi. Kihikihi, meaning curved, makes a reference to the bill of the Kauaʻi ʻamakihi. The Kauaʻi ʻamakihi has similar physical features to an extinct species, the Kauaʻi nukupuʻu. When flying or feeding, the Kaua’i ‘amakihi lets out a distinguishing tweet.
The Oʻahu ʻalauahio, also known as the Oʻahu creeper, is a small finch-like Hawaiian honeycreeper that is endemic to the Hawaiian island of Oahu. It is Critically endangered.
The razor-billed curassow is a species of bird in the family Cracidae, the chachalacas, guans, and curassows. It is found in Bolivia, Brazil, Colombia, and Peru.
The red-browed amazon is a species of parrot in the family Psittacidae. It is endemic to Atlantic Forest in eastern Brazil. It has been considered a subspecies of the blue-cheeked amazon, but today all major authorities consider them separate species. It is threatened both by habitat loss and by being captured for the trade in wild parrots.
The Socorro parakeet, known in aviculture as the Socorro green conure or Socorro conure, is a species of bird in subfamily Arinae of the family Psittacidae, the African and New World parrots. It is endemic to Socorro Island in the Revillagigedo Islands, Mexico.
The Hawaiian coot, also known as the ʻ'alae ke'oke'o in Hawaiian, is a bird in the rail family, Rallidae, that is endemic to Hawaiʻi. In Hawaiian, ʻalae is a noun and means mud hen. Kea or its synonym keo is an adjective for white. It is similar to the American coot at 33–40.6 cm (13–16 in) in length and weighing around 700 g. It has black plumage and a prominent white frontal shield. Its natural habitats are freshwater lakes, freshwater marshes, coastal saline lagoons, and water storage areas. The bird was federally listed in October 1970 as an endangered species and is considered both endemic and endangered by the state of Hawaii. It is threatened by habitat loss and introduced predators such as the small Asian mongoose. The Makalawena Marsh on the Big Island of Hawaiʻi has been listed as a National Natural Landmark to preserve one of its last nesting areas.
The Guam flycatcher, or Guam broadbill, is an extinct species of bird in the family Monarchidae formerly endemic to Guam.
The Chuuk flycatcher, formerly sometimes known as the oceanic flycatcher, is a species of bird in the family Monarchidae. It is endemic to Micronesia and can be found on the Caroline Islands. The diversity of traits in the Oceanic flycatchers resulted from three waves of colonization in non-overlapping times, which led to situ specification events on Micronesian islands.
The Alagoas tyrannulet is a species of bird in the family Tyrannidae. It is endemic to the Atlantic Forest in eastern Brazil. Its natural habitat is subtropical or tropical moist lowland forest. It is threatened by habitat loss.
The bridled white-eye is a species of white-eye native to the Mariana Islands and formerly Guam. The species' natural habitat is tropical forests, shrublands and urban areas.
Sideroxylon socorrense is a plant species in the family Sapotaceae. It is endemic to Mexico, native to Socorro Island in the Revillagigedo Islands and to the Pacific coast states of Sinaloa and Nayarit on the Mexican mainland.