Giant cowbird

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Giant cowbird
Giant cowbird (Molothrus oryzivorus oryzivorus) Las Tangaras.jpg
M. o. oryzivorus in Colombia
Giant cowbird call
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Icteridae
Genus: Molothrus
Species:
M. oryzivorus
Binomial name
Molothrus oryzivorus
(Gmelin, JF, 1788)
Molothrus oryzivorus map.svg
Range of M. oryzivorus.
Synonyms

Scaphidura oryzivora

The giant cowbird (Molothrus oryzivorus) is a large passerine bird in the New World family Icteridae. It breeds from southern Mexico south to northern Argentina, and on Trinidad and Tobago. It may have relatively recently colonised the latter island. It is a brood parasite and lays its eggs in the nests of other birds.

Contents

Taxonomy

The giant cowbird was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae . He placed it with the orioles in the genus Oriolus and coined the binomial name Oriolus oryzivorus. [2] Gmelin based his account on the "rice bird" from Cayenne that had been described in 1782 by the English ornithologist John Latham in his multi-volume work A General Synopsis of Birds. [3] The specific epithet is from Latin oryza meaning "rice" and -vorus meaning "eating". [4] The giant cowbird is now one of six cowbirds placed in the genus Molothrus that was introduced in 1832 by William Swainson. [5]

Two subspecies are recognised: [5]

Distribution and habitat

It is associated with open woodland and cultivation with large trees, but is also the only cowbird that is found in deep forest.

Description

The male giant cowbird is 34 cm (13 in) long, weighs 174–242 g (6.1–8.5 oz) and is iridescent black, with a long tail, long bill, small head, and a neck ruff which is expanded in display. The female is smaller, averaging 29 cm (11 in) in length and weighing 144–167 g (5.1–5.9 oz). The female is less iridescent than the male, and the absence of the neck ruff makes her look less small-headed. Juvenile males are similar to the adult male, but browner, and with a pale, not black, bill. [6]

It is a quiet bird, particularly for an icterid, but the male has an unpleasant screeched whistle, shweeaa-tpic-tpic. The call is a sharp chek-chik. They are also very adept mimics.

Behaviour

Breeding

Like other cowbirds, it is a brood parasite, laying its eggs in the nests of oropendolas and caciques. The eggs are of two types, either whitish and unspotted, or pale blue or green with dark spots and blotches. The host's eggs and chicks are not destroyed. Their icterid hosts breed colonially, and defend their nests vigorously, so even a large, bold and aggressive species like the giant cowbird has to cover an extensive territory to find sufficient egg-laying opportunities. Several giant cowbird eggs may be laid in one host nest.

Food and feeding

This gregarious bird feeds mainly on insects, and some seeds, including rice, and forages on the ground or in trees. It also searches for fruit, nectar, and arthropods along lakes and rivers, and in banana plantations and corn. [7] It rarely perches on cattle, unlike some of its relatives, but in Brazil it will ride on capybaras as it removes ticks [7] and/or horse flies. [8]

Related Research Articles

<span class="mw-page-title-main">Icterid</span> Family of birds, often black with yellow, orange, or red markings

Icterids or New World blackbirds make up a family, the Icteridae, of small to medium-sized, often colorful, New World passerine birds. The family contains 108 species and is divided into 30 genera. Most species have black as a predominant plumage color, often enlivened by yellow, orange, or red. The species in the family vary widely in size, shape, behavior, and coloration. The name, meaning "jaundiced ones" comes from the Ancient Greek ikteros via the Latin ictericus. This group includes the New World blackbirds, New World orioles, the bobolink, meadowlarks, grackles, cowbirds, oropendolas, and caciques.

<span class="mw-page-title-main">Brown-headed cowbird</span> Species of bird

The brown-headed cowbird is a small, obligate brood parasitic icterid native to temperate and subtropical North America. It is a permanent resident in the southern parts of its range; northern birds migrate to the southern United States and Mexico in winter, returning to their summer habitat around March or April.

<span class="mw-page-title-main">New World oriole</span> Genus of birds

New World orioles are a group of birds in the genus Icterus of the blackbird family. Unrelated to Old World orioles of the family Oriolidae, they are strikingly similar in size, diet, behavior, and strongly contrasting plumage. As a result, the two have been given the same vernacular name.

<span class="mw-page-title-main">Cowbird</span> Genus of birds

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.

<span class="mw-page-title-main">Great-tailed grackle</span> Species of bird in North America

The great-tailed grackle or Mexican grackle is a medium-sized, highly social passerine bird native to North and South America. A member of the family Icteridae, it is one of 10 extant species of grackle and is closely related to the boat-tailed grackle and the extinct slender-billed grackle. In the southern and southwestern United States, the grackle is sometimes referred to simply as a "blackbird" or (erroneously) a "crow" due to its glossy black plumage; however, grackles form their own unique genus that is separate from other "blackbirds", such as the red-winged and Brewer's blackbirds, despite being in the same family (Icteridae). Superficially, Brewer's blackbird is one of the most visually similar species to grackles.

<span class="mw-page-title-main">Red-breasted meadowlark</span> Species of bird

The red-breasted meadowlark is a passerine bird in the New World family Icteridae. It was formerly named red-breasted blackbird but is not closely related to the red-winged blackbird group.

<span class="mw-page-title-main">Shiny cowbird</span> Species of bird

The shiny cowbird is a passerine bird in the New World family Icteridae. It breeds in most of South America except for dense forests and areas of high altitude such as mountains. Since 1900 the shiny cowbird's range has shifted northward, and it was recorded in the Caribbean islands as well as the United States, where it is found breeding in southern Florida. It is a bird associated with open habitats, including disturbed land from agriculture and deforestation.

<span class="mw-page-title-main">White-browed meadowlark</span> Species of bird

The white-browed meadowlark is a passerine bird in the New World family Icteridae. It was formerly named white-browed blackbird but is not closely related to the red-winged blackbird group.

<span class="mw-page-title-main">Bronzed cowbird</span> Species of bird in the Americas

The bronzed cowbird, once known as the red-eyed cowbird, is a small icterid.

<span class="mw-page-title-main">Chestnut-headed oropendola</span> Species of bird

The chestnut-headed oropendola is a New World tropical icterid bird. The scientific name of the species commemorates Johann Georg Wagler, who established Psarocolius, the oropendola genus.

<span class="mw-page-title-main">Montezuma oropendola</span> Species of bird

The Montezuma oropendola is a New World tropical icterid bird. It is a resident breeder in the Caribbean coastal lowlands from southeastern Mexico to central Panama, but is absent from El Salvador and southern Guatemala. It also occurs on the Pacific slope of Nicaragua and Honduras and northwestern and southwestern Costa Rica. It is among the oropendola species sometimes separated in the genus Gymnostinops. The English and scientific names of this species commemorate the Aztec emperor Moctezuma II.

<span class="mw-page-title-main">Shining bronze cuckoo</span> Species of bird

The shining bronze cuckoo is a species of cuckoo in the family Cuculidae, found in Australia, Indonesia, New Caledonia, New Zealand, Papua New Guinea, Solomon Islands, and Vanuatu. It was previously also known as Chalcites lucidus.

<span class="mw-page-title-main">Oriole blackbird</span> Species of bird

The oriole blackbird is a species of bird in the family Icteridae. Its genus, Gymnomystax, is monotypic. It is a medium-sized yellow and black bird found in Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela, where its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist shrubland, subtropical or tropical seasonally wet or flooded lowland grassland, and swamps.

<span class="mw-page-title-main">Red-bellied grackle</span> Species of bird

The red-bellied grackle is a species of bird in the family Icteridae. Its genus, Hypopyrrhus, is monotypic.

<span class="mw-page-title-main">Martinique oriole</span> Species of bird

The Martinique oriole is a species of bird in the family Icteridae. It is endemic to Martinique, French West Indies. Martinique is a part of the Lesser Antilles, and is located in the Eastern Caribbean.

<span class="mw-page-title-main">Campo troupial</span> Species of bird

The campo troupial or campo oriole is a species of bird in the family Icteridae that is found in northeastern Brazil. At one time thought to be conspecific with the Venezuelan troupial and orange-backed troupial, it is now accepted as a separate species. It is a fairly common bird and the International Union for Conservation of Nature has rated it as a "least-concern species".

<span class="mw-page-title-main">Screaming cowbird</span> Species of bird

The screaming cowbird is an obligate brood parasite belonging to the family Icteridae and is found in South America. It is also known commonly as the short billed cowbird.

<span class="mw-page-title-main">Green oropendola</span> Species of bird

The green oropendola is a species of bird in the family Icteridae. It is found in wooded habitats in the Amazon basin and Guianas of South America, and is generally common. Uniquely among the oropendolas, the green oropendola has a pale bill with an orange tip. Male oropendola weigh around 400 grams, while females are in the 200 gram range. This is a common species and the International Union for Conservation of Nature has rated its status as being of "least concern".

<span class="mw-page-title-main">Saffron-cowled blackbird</span> Species of bird

The saffron-cowled blackbird is a species of bird in the family Icteridae. It is the only species placed in the genus Xanthopsar. It has bright yellow underparts and black or dark brown upperparts. It is found in Argentina, Brazil, Paraguay, and in Uruguay at the Quebrada de los Cuervos. Its natural habitats are subtropical or tropical dry lowland grassland, subtropical or tropical seasonally wet or flooded lowland grassland, and pastureland. It is threatened by habitat loss.

The bronze-brown cowbird is a species of bird in the family Icteridae. It was long thought to be an isolated population of bronzed cowbird. Because it is found only in a narrow coastal band in northwestern Colombia, it is considered near-threatened by the International Union for Conservation of Nature.

References

  1. BirdLife International (2012). "Molothrus oryzivorus". IUCN Red List of Threatened Species . 2012. IUCN: e.T22724358A39896920. doi: 10.2305/IUCN.UK.2012-1.RLTS.T22724358A39896920.en .
  2. Gmelin, Johann Friedrich (1788). Systema naturae per regna tria naturae : secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis (in Latin). Vol. 1, Part 1 (13th ed.). Lipsiae [Leipzig]: Georg. Emanuel. Beer. p. 386.
  3. Latham, John (1782). A General Synopsis of Birds. Vol. 1, Part 2. London: Printed for Benj. White. p. 423.
  4. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 285. ISBN   978-1-4081-2501-4.
  5. 1 2 Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2023). "Oropendolas, orioles, blackbirds". IOC World Bird List Version 13.2. International Ornithologists' Union. Retrieved 18 November 2023.
  6. Fraga, R.M. (2011). "Family Icteridae (New World Blackbirds)" . In del Hoyo, J.; Elliott, A.; Sargatal, J. (eds.). Handbook of the Birds of the World. Vol. 16: Tanagers to New World Blackbirds. Barcelona, Spain: Lynx Edicions. pp. 684–807 [785]. ISBN   978-84-96553-78-1.
  7. 1 2 Giant Cowbird sta.uwi.edu
  8. Robinson, Scott K. (1998). "Foraging ecology and host relationships of giant cowbirds in Southeastern Peru" (PDF). Wilson Bulletin. 100 (2): 224–235. JSTOR   4162562.

Further reading