Montezuma oropendola

Last updated

Montezuma oropendola
Montezuma oropendola (Psarocolius montezuma) on wild papaya Orange Walk.jpg
feeding on wild papaya in Belize
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Icteridae
Genus: Psarocolius
Species:
P. montezuma
Binomial name
Psarocolius montezuma
(Lesson, 1830)
Psarocolius montezuma map.svg
Range of Psarocolius montezuma
Synonyms

Gymnostinops montezuma

The Montezuma oropendola (Psarocolius montezuma) 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.

Contents

Description

Adult males are mainly chestnut with a blackish head and rump, and a tail which is bright yellow apart from two dark central feathers. There is a bare blue cheek patch and a pink wattle, the iris is brown, and the long bill is black at the base with a red tip. Females are similar, but smaller than males with a smaller wattle. Young birds are duller than adults and have a paler and less demarcated bill. No subspecies are currently recognized.

The sexes are very different in size; the male is 50 cm (20 in) long and weighs 520 g (18 oz); the smaller female is 38 cm (15 in) long and weighs 230 g (8.1 oz). In total body mass, the males are 100% bigger than the females, which is a 2:1 body-to-mass ratio and makes the Montezuma oropendola one of the most sexually-dimorphic birds in the world. Webster et al. says that the size difference in males and females is probably directly related to differences in foraging habits. The females often forage on thin branches, eating insects out of curled up leaves, while the males often perch on thick branches and forage in epiphytes and bromeliads. [2]

Webster et al. also found that sexual dimorphism was more obvious in length of the wing and body mass. Male size and body mass is associated with sexual fitness and dominance. Webster et al. observed that males defend sexually-receptive females, suggesting that Montezuma oropendolas have a female-defence mating system. While the females nest, the males fight and fend off one another, and the males were ranked depending on the outcome of each fight. The alpha male eventually pushes out all other males until he is the only one left. When the alpha males leave the others come back and defend females until he returns. This type of mating system is similar to that of polygynous mammals, not birds. [3]

The "unforgettable" [4] song of the male Montezuma oropendola is given during the bowing display, and consists of a conversational bubbling followed by loud gurgles, tic-tic-glik-glak-GLUUuuuuu. Both sexes have loud cack and crrrk calls. In a recent study by on male Montezuma oropendolas, researchers found that, when at breeding sites, males often changed the lowest peak frequency. When males were singing and their song overlapped, the largest male could out-compete the other males at the colony by changing how loud and how deep his lowest peak frequency was. [5]

Range and habitat

Hanging nests in farmland near Quesada, Costa Rica Montezuma's oropendola.jpg
Hanging nests in farmland near Quesada, Costa Rica
British Honduras stamp featuring a Montezuma oropendola 1962 5 dollar stamp British Honduras.jpg
British Honduras stamp featuring a Montezuma oropendola

The Montezuma oropendola is a quite common bird in parts of its range. They are omnivorous and are often seen in small or larger flocks foraging in trees for small vertebrates, large insects, nectar, and fruit, including bananas, Cecropia spikes, gumbo-limbo (Bursera simaruba) and Trophis racemosa (Moraceae). [6] Outside the breeding season, this species is quite mobile, with some seasonal movements.

The Montezuma oropendola inhabits forest canopy, edges and old plantations. It is a colonial breeder and only the females build hanging woven nest of fibres and vines, 60–180 cm (24–71 in) long, in a tree that is up to 30 meters high. Each colony has a dominant male, which mates with most of the females following an elaborate bowing display. The female lays two dark-spotted white or buff eggs, and she incubates them without the male until they hatch in 15 days; the young fledge in 30. While the young are still in their nests they are most often fed spiders and other arthropods, frogs, lizards, and fruits. There are typically about 30 nests in a colony, but up to 172 have been recorded. [7]

Intraspecific relationships

Although the chestnut-headed oropendola shares much of this species's range, it is smaller, mainly black with a chestnut head (instead of mainly chestnut with a blackish head), and lacks coloured facial patches, so the two oropendolas are unlikely to be confused.

Unlike some populations of its relative, the chestnut-headed oropendola, the Montezuma oropendola does not tolerate brood parasites near their nests. Although Montezuma oropendolas do not have many defenses against Cowbirds, when females see a Giant Cowbird near their own nest they actively defend their nest by attacking the Cowbirds and forcing them to leave their colony. Webster et al. found that the females did not drive the cowbirds away until they were approaching their own nests. This study also found that unlike chestnut-headed oropendolas, the Montezuma oropendolas did not nest near social Hymenoptera. Combined with the fact that Montezuma oropendolas do not allow Cowbirds near their nest, they have no defense against botflies. Nest success is fairly low for the Montezuma Oropendola. The females lay an average of two eggs per nest, but only one is fledged and only one third of the nests in the colonies are successful. Because of their relatively low nest success rate, brood parasites are too high a risk to have around the Montezuma oropendolas nest. [8]

Related Research Articles

<span class="mw-page-title-main">American goldfinch</span> Small North American migratory bird in the finch family

The American goldfinch is a small North American bird in the finch family. It is migratory, ranging from mid-Alberta to North Carolina during the breeding season, and from just south of the Canada–United States border to Mexico during the winter.

<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. 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">Wood thrush</span> Species of bird

The wood thrush is a North American passerine bird. It is closely related to other thrushes such as the American robin and is widely distributed across North America, wintering in Central America and southern Mexico. The wood thrush is the official bird of the District of Columbia.

<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">Cliff swallow</span> Species of bird

The cliff swallow or American cliff swallow is a member of the passerine bird family Hirundinidae, the swallows and martins. The generic name Petrochelidon is derived from Ancient Greek petros meaning "rock" and khelidon "swallow", and the specific name pyrrhonota comes from purrhos meaning "flame-coloured" and -notos "-backed".

<span class="mw-page-title-main">Australian zebra finch</span> Species of bird

The Australian zebra finch or chestnut-eared finch is the most common estrildid finch of Central Australia. It ranges over most of the continent, avoiding only the cool humid south and some areas of the tropical far north. The bird has been introduced to Puerto Rico and Portugal. Due to the ease of keeping and breeding the zebra finch in captivity, it has become Australia’s most widely studied bird; by 2010, it was the most studied captive model passerine species worldwide, by a considerable margin.

<span class="mw-page-title-main">Carolina wren</span> Species of bird

The Carolina wren is a common species of wren that is a resident in the eastern half of the United States of America, the extreme south of Ontario, Canada, and the extreme northeast of Mexico. Severe winters restrict the northern limits of their range, while favorable weather conditions lead to a northward extension of their breeding range. Their preferred habitat is in dense cover in forest, farm edges, and suburban areas. This wren is the state bird of South Carolina.

<span class="mw-page-title-main">Brood parasitism</span> Subclass of parasitism, phenomenon that an animal relies on other inidivids to raise its young.

Brood parasitism is a subclass of parasitism and phenomenon and behavioural pattern of certain animals, brood parasites, that rely on others to raise their young. The strategy appears among birds, insects and fish. The brood parasite manipulates a host, either of the same or of another species, to raise its young as if it were its own, usually using egg mimicry, with eggs that resemble the host's.

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

The crested oropendola, also known as the Suriname crested oropendola or the cornbird, is a New World tropical icterid bird. It is a resident breeder in lowland South America east of the Andes, from Panama and Colombia south to northern Argentina, as well as on Trinidad and Tobago. If the genus Gymnostinax for the Montezuma oropendola and its closest relatives were considered valid, this species would probably belong in that genus.

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

The giant cowbird 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.

<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">Oropendola</span> Genus of birds

Oropendolas are a genus of passerine birds, Psarocolius, in the New World blackbird family Icteridae. They were formerly split among two or three different genera and are found in Central and South America.

<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 sparrow</span> Species of bird

The chestnut sparrow is a species of passerine bird in the sparrow family Passeridae. It is the smallest member of the sparrow family, at about 11 cm (4.3 in) long. The breeding male has deep chestnut plumage and the female and juvenile are coloured a duller grey with some chestnut markings. Like its closest relatives in the genus Passer, the Arabian golden sparrow and the Sudan golden sparrow, it is gregarious and found in arid areas. Ranging through the east of Africa from Darfur in Sudan to Tanzania, it is found in dry savanna, papyrus swamps, and near human habitation. Adults and juveniles both feed mostly on grass seeds, and fly in flocks, often with other species of birds, to find food. It nests in trees, building its own domed nests, and also usurping the more elaborate nests of weavers.

<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">Olive oropendola</span> Species of bird

The olive oropendola is the largest member of the icterid family and rivals the Amazonian umbrellabird as the largest passerine bird in South America. It is sometimes placed in the genus Gymnostinops instead of Psarocolius. As suggested by its name, it is found widely – but often in low densities – throughout humid lowland forests of the Amazon Basin, with the notable exception of most of the Guiana Shield. It is sometimes split into two species, the western olive oropendola and the eastern Pará oropendola, but the subspecies P. y. neivae is widely recognized as a hybrid swarm, and the vast majority of authorities consider them a single 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">Black oropendola</span> Species of bird

The black oropendola is a species of bird in the family Icteridae. It is found in Colombia and Panama. Its natural habitat is subtropical or tropical moist lowland forests.

<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".

<i>Synoeca septentrionalis</i> Species of stinging wasp

Synoeca septentrionalis is one of five species of wasps in the genus Synoeca. It is a swarm-founding wasp that is also eusocial, exhibiting complicated nest structure and defense mechanisms and a colony cycle including a pre-emergence phase and a post-emergence phase. It is typically found in areas from Central to South America. This wasp is one of the larger species of paper wasps and exhibits multiple morphological adaptations as a result of this. Synoeca septentrionalis is known for possessing a very painful sting.

References

  1. BirdLife International (2020). "Psarocolius montezuma". IUCN Red List of Threatened Species . 2020: e.T22724004A138236998. doi: 10.2305/IUCN.UK.2020-3.RLTS.T22724004A138236998.en . Retrieved 12 November 2021.
  2. Webster, Michael S. (1997). "Extreme Sexual Size Dimorphism, Sexual Selection, and the Foraging Ecology of Montezuma Oropendolas". The Auk. 114 (4): 570–580. doi: 10.2307/4089276 . JSTOR   4089276.
  3. Webster, Michael S. (1994-10-01). "Female-defence polygyny in a Neotropical bird, the Montezuma oropendola". Animal Behaviour. 48 (4): 779–794. doi: 10.1006/anbe.1994.1302 . ISSN   0003-3472. S2CID   53178647.
  4. Howell, Steven N. G. & Webb, Sophie (1995): A Guide to the Birds of Mexico and Northern Central America. Oxford University Press, Oxford & New York. ISBN   0-19-854012-4
  5. Price, J. Jordan; Earnshaw, Sarah M.; Webster, Michael S. (2006-04-01). "Montezuma oropendolas modify a component of song constrained by body size during vocal contests". Animal Behaviour. 71 (4): 799–807. doi:10.1016/j.anbehav.2005.05.025. ISSN   0003-3472. S2CID   53179839.
    • Foster, Mercedes S. (2007): The potential of fruiting trees to enhance converted habitats for migrating birds in southern Mexico. Bird Conservation International17(1): 45-61. doi : 10.1017/S0959270906000554 PDF fulltext
  6. "Montezuma Oropendola - Diet and Foraging | Neotropical Birds Online". neotropical.birds.cornell.edu. Retrieved 2018-04-04.
  7. Webster, Michael S. (1994). "Interspecific Brood Parasitism of Montezuma Oropendolas by Giant Cowbirds: Parasitism or Mutualism?". The Condor. 96 (3): 794–798. doi:10.2307/1369483. JSTOR   1369483.

Further reading