The convex-billed cowbird (''Pandanaris convexa'') is an extinct species of

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

in the family Icteridae, described in 1947 by Alden H. Miller. It is the only member of its genus, ''Pandanaris''.

Physiology

''Pandanaris convexa'' has an upper mandible (7.0 mm in length) similar to that of the

extant Extant is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Extant taxon, a taxon which is not extinct, ...

cowbird Cowbirds are birds belonging to the genus ''Molothrus'' in the family Icteridae. They are of New World origin, and are obligate brood parasites, laying their eggs in the nests of other species. The genus was introduced by English naturalist Will ...

s in the genus ''

Molothrus Cowbirds are birds belonging to the genus ''Molothrus'' in the family Icteridae. They are of New World origin, and are obligate brood parasites, laying their eggs in the nests of other species. The genus was introduced by English naturalist W ...

'', though its narial opening is approximately 30% larger. In addition, Miller found that the species' internarial bridge was entirely different from other cowbirds and blackbirds. The species has a distinct "even" curvature of its culmen that is not found in any other icterid.

Distribution

Based on fossil evidence, the convex-billed cowbird had a large distribution throughout

the Americas The Americas, which are sometimes collectively called America, are a landmass comprising the totality of North America, North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World. ...

. The first remains were from the

La Brea Tar Pits La Brea Tar Pits is an active paleontological research site in urban Los Angeles. Hancock Park was formed around a group of tar pits where natural asphalt (also called asphaltum, bitumen, or pitch; ''brea'' in Spanish) has seeped up from the gro ...

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, and remains have also been found in

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...

. Other remains have also been found at San Clemente de Térapa in the Mexican state of

Sonora Sonora (), officially Estado Libre y Soberano de Sonora ( en, Free and Sovereign State of Sonora), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. The state is d ...

, mixed with the remains of extant icterid species such as the

red-winged blackbird The red-winged blackbird (''Agelaius phoeniceus'') is a passerine bird of the family Icteridae found in most of North America and much of Central America. It breeds from Alaska and Newfoundland south to Florida, the Gulf of Mexico, Mexico, and ...

(''Agelaius phoeniceus'') and

orchard oriole The orchard oriole (''Icterus spurius'') is the smallest species of icterid. The subspecies of the Caribbean coast of Mexico, ''I. s. fuertesi'', is sometimes considered a separate species, the ochre oriole or Fuertes's oriole. Description Mea ...

(''Icterus spurius''). More remains have been found as far south as the

Talara Tar Seeps Talara is a city in the Talara Province of the Piura Region, in northwestern Peru. It is a port city on the Pacific Ocean with a population of 91,444 as of 2017. Its climate is hot and dry. Due to its oil reserves, and ability to produce aviation ...

in northwestern

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

Extinction

Along with many other birds of the late Quaternary, the convex-billed cowbird likely co-evolved with

Pleistocene megafauna Pleistocene megafauna is the set of large animals that lived on Earth during the Pleistocene epoch. Pleistocene megafauna became extinct during the Quaternary extinction event resulting in substantial changes to ecosystems globally. The role of hu ...

, inhabiting the

grassland A grassland is an area where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur natur ...

habitats that were shaped by these species and feeding on the insects that their foraging stirred up. With the eventual

extinction Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

of the megafauna, ''Pandanaris'' was unable to adapt to the altered conditions and eventually went

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

. The other still-extant icterid species that also inhabited the same areas, such as the red-winged blackbirds and orchard orioles, may have also been

extirpated Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinct ...

from these altered habitats, but the species as a whole were able to tolerate them, with some populations surviving in other areas and later recolonizing the altered habitats they were previously extirpated from. In contrast, ''Pandanaris'' may have been so wholly dependent on megafaunal communities that it could not tolerate the altered habitats and went fully went extinct throughout its range.

References

{{Taxonbar, from=Q7130490 Icteridae Extinct birds of North America Taxa named by Alden H. Miller Late Quaternary prehistoric birds