Audubon's oriole

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Audubon's oriole
Audubon's Oriole (12626811374).jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Icteridae
Genus: Icterus
Species:
I. graduacauda
Binomial name
Icterus graduacauda
Lesson, 1839
Icterus graduacauda map.svg

Audubon's oriole (Icterus graduacauda), formerly known as the black-headed oriole, is a New World passerine inhabiting the forests and thickets of southeastern Texas and the Mexican coast. It is the only species to have a black hood and yellow body. It is divided into four subspecies and two allopatric breeding ranges. The westernmost range extends from Nayarit south to southern Oaxaca, whereas the eastern range stretches from the lower Rio Grande valley to northern Querétaro. The most common in the western range are the subspecies I. g. dickeyae and I. g. nayaritensis; I. g. graduacauda and I. g. audubonii can be found in the eastern range. Like most Central American birds, it is not a migratory species and does not display significant sexual dimorphism. DNA analysis of the ND2 and cyt-b genes strongly suggests that I. graduacauda is most closely related to I. chrysater, the yellow-backed oriole. [2] It is a member of the genus Icterus and therefore should not be confused with the Old World orioles.

Contents

Description

The male of the species has a black hood, mandible, and throat, as well as a black tail. Wings are black, but the remiges and rectrices (flight feathers) are fringed with white. The secondary coverts form yellow epaulets. The back and vent are yellow washed with olive, and the underside is almost uniformly yellow. Females of this species have a slightly more olive nape and back than the males. The adult female's plumage is similar to the juvenile plumage; however, unlike adults, the wings are dull brown instead of black. In general, immature specimens have the hood; wingbars; remiges; and epaulets of adult specimens. The first-basic plumage retains the darker, greener coloration of the juvenile plumage, however. Molting generally occurs in early autumn, though some specimens have been noted to molt as early as June.

Subspecies dickeyae

The subspecies I. g. dickeyae is of note because of the differences in appearance, behavior, and phylogeny between it and the other subspecies of I. graduacauda. The olive wash is weaker, making the bird more proportionally yellow than others of its species. In addition, the yellow epaulets are diminished in dickeyae, being confined to the lesser coverts. This subspecies is endemic to high altitude pine forests is western Mexico.

Behavior

Audubon's oriole inhabits dense evergreen forests and thickets, preferring riparian (riverside) areas. Though it prefers the shade, mating pairs may occasionally spotted foraging in clearings. In flight, it joins mixed-species flocks that include orioles, jays, tanagers, and other birds of similar size. It forages in dense vegetation, often near forest clearings. [3]

Reproduction

The nest of the Audubon's oriole is similar in size and construction to those of the hooded and orchard orioles, being approximately three inches in diameter with a similar depth. It resembles a hanging pouch or basket, not as deep as other species'. The rim is firmly woven to the supporting twigs and the entrance is somewhat constricted. The nest itself is usually composed of long grass stems, woven while they are still green and lined with finer grass. [4]

A mating pair of orioles usually incubates two broods per year, each consisting of between three and five eggs per brood; however, chicks hatched from the later brood are usually unable to survive the winter. This species' nests are often a popular choice of parasitization by the Brown-headed cowbird. [3]

Voice

The song of the Audubon's oriole is a series of slow, slurry whistles. Its calls include a nasal "ike, ike, ike" and a whistled "peu". [5]

Diet

It inserts its bill into soft dead wood or plants and uses its beak to force said plant open to expose insects hiding inside. It feeds on insects, spiders, fruits, and also accepts sunflower seeds from bird feeders. [3]

Related Research Articles

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Bronzed cowbird Species of bird in the Americas

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Yellow-tailed oriole Species of bird

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Yellow-shouldered blackbird Species of bird

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Silver-throated tanager Species of bird

The silver-throated tanager is a species of passerine bird in the tanager family Thraupidae. It is found in Costa Rica, Panama, Colombia, Ecuador, and northeastern Peru. It inhabits mossy forests, montane evergreen forests, tropical lowland evergreen forests and forest edges, along with tall secondary forests, along with disturbed habitat with remnant trees and forest. It is 13 centimetres (5.1 in) long and weighs 22 grams (0.78 oz) on average, and shows slight sexual dimorphism, with duller female plumage. Adult males are mainly bright yellow, with a silvery-white throat bordered above with a black stripe on the cheeks, black streaking on the back, and green edges to the wings and tail. Juveniles are duller and greener.

Martinique oriole Species of bird

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Yellow-backed oriole Species of bird

The yellow-backed oriole is a species of bird in the family Icteridae.

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Hispaniolan oriole Species of oriole endemic to Hispanola

The Hispaniolan oriole is a species of bird in the family Icteridae. It is endemic to the Caribbean island of Hispaniola.

Cuban oriole Species of songbird

The Cuban oriole is a species of songbird in the family Icteridae. It is endemic to Cuba.

Bahama oriole Species of songbird

The Bahama oriole is a species of songbird in the New World blackbird family - Icteridae. It is endemic to the Bahamas. It is listed as critically endangered by the IUCN (CR). The taxon was originally classified as its own distinct species in 1890 by Joel Asaph Allen before it was lumped with the Cuban oriole, Hispaniolan oriole, and Puerto Rican oriole into a single species by the ornithologist James Bond in his book "Birds of the West Indies". It wasn't until 2010 that all four birds were again elevated to full species status based on a combination of evidence from DNA, plumage and song. Since it was not recognized as a distinct species for so long, the Bahama oriole's preferred non-breeding season habitat is unknown and current estimates of its exact numbers remain vague.

Puerto Rican oriole Species of bird

The Puerto Rican oriole is a species of bird in the family Icteridae, and genus Icterus or New World blackbirds. This species is a part of a subgroup of orioles that includes the North American orchard oriole, Icterus spurius, and the hooded oriole, Icterus cucullatus.

References

  1. BirdLife International (2020). "Icterus graduacauda". IUCN Red List of Threatened Species . 2020: e.T22724081A138250610. doi: 10.2305/IUCN.UK.2020-3.RLTS.T22724081A138250610.en . Retrieved 12 November 2021.
  2. Omland, Kevin E.; Lanyon, Scott M.; Fritz, Sabine J. (1999). "A Molecular Phylogeny of the New World Orioles (Icterus): The Importance of Dense Taxon Sampling". Molecular Phylogenetics and Evolution. 12 (2): 224–39. doi:10.1006/mpev.1999.0611. PMID   10381325.
  3. 1 2 3 "Audubon's oriole, Life History". All About Birds. Cornell Lab of Ornithology. Retrieved 9 May 2016.
  4. "Audubon Field Guide". National Audubon Society. 13 November 2014. Retrieved 9 May 2016.
  5. "Audubon's Oriole Sounds, All About Birds, Cornell Lab of Ornithology".

Further reading