The Montezuma oropendola (''Psarocolius montezuma'') is a
New World
The term "New World" is used to describe the majority of lands of Earth's Western Hemisphere, particularly the Americas, and sometimes Oceania."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: ...
tropical
icterid
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 ...
bird. It is a resident breeder in the
Caribbean
The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
coastal lowlands from southeastern
Mexico
Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...
to central
Panama
Panama, officially the Republic of Panama, is a country in Latin America at the southern end of Central America, bordering South America. It is bordered by Costa Rica to the west, Colombia to the southeast, the Caribbean Sea to the north, and ...
, but is absent from
El Salvador
El Salvador, officially the Republic of El Salvador, is a country in Central America. It is bordered on the northeast by Honduras, on the northwest by Guatemala, and on the south by the Pacific Ocean. El Salvador's capital and largest city is S ...
and southern
Guatemala
Guatemala, officially the Republic of Guatemala, is a country in Central America. It is bordered to the north and west by Mexico, to the northeast by Belize, to the east by Honduras, and to the southeast by El Salvador. It is hydrologically b ...
. It also occurs on the
Pacific
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...
slope of
Nicaragua
Nicaragua, officially the Republic of Nicaragua, is the geographically largest Sovereign state, country in Central America, comprising . With a population of 7,142,529 as of 2024, it is the third-most populous country in Central America aft ...
and
Honduras
Honduras, officially the Republic of Honduras, is a country in Central America. It is bordered to the west by Guatemala, to the southwest by El Salvador, to the southeast by Nicaragua, to the south by the Pacific Ocean at the Gulf of Fonseca, ...
and northwestern and southwestern
Costa Rica
Costa Rica, officially the Republic of Costa Rica, is a country in Central America. It borders Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest, as well as Maritime bo ...
. It is among the oropendola
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
sometimes separated in the
genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
''Gymnostinops''. The English and scientific names of this species commemorate the
Aztec
The Aztecs ( ) were a Mesoamerican civilization that flourished in central Mexico in the Post-Classic stage, post-classic period from 1300 to 1521. The Aztec people included different Indigenous peoples of Mexico, ethnic groups of central ...
emperor
Moctezuma II
Moctezuma Xocoyotzin . ( – 29 June 1520), retroactively referred to in European sources as Moctezuma II, and often simply called Montezuma,Other variant spellings include Moctezuma, Motewksomah, Motecuhzomatzin, Moteuczoma, Motecuhzoma, Motē ...
.
Description
Adult males are mainly chestnut with a blackish head and rump, and a tail which is bright yellow apart from two dark central
feather
Feathers are epidermal growths that form a distinctive outer covering, or plumage, on both avian (bird) and some non-avian dinosaurs and other archosaurs. They are the most complex integumentary structures found in vertebrates and an exa ...
s. 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
Bill(s) may refer to:
Common meanings
* Banknote, paper cash (especially in the United States)
* Bill (law), a proposed law put before a legislature
* Invoice, commercial document issued by a seller to a buyer
* Bill, a bird or animal's beak
Pl ...
. No
subspecies
In Taxonomy (biology), biological classification, subspecies (: subspecies) is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (Morphology (biology), morpholog ...
are currently recognized.

The sexes are very different in size; the male is long and weighs ; the smaller female is long and weighs . 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
epiphyte
An epiphyte is a plant or plant-like organism that grows on the surface of another plant and derives its moisture and nutrients from the air, rain, water (in marine environments) or from debris accumulating around it. The plants on which epiphyt ...
s and
bromeliads
The Bromeliaceae (the bromeliads) are a family of monocot flowering plants of about 80 genera and 3700 known species, native mainly to the tropical Americas, with several species found in the American subtropics and one in tropical west Africa, ...
.
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
A mating system is a way in which a group is structured in relation to sexual behaviour. The precise meaning depends upon the context. With respect to animals, the term describes which males and females mating, mate under which circumstances. Reco ...
. 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.
Vocalizations
The "unforgettable"
[Howell, Steven N. G. & Webb, Sophie (1995): ''A Guide to the Birds of Mexico and Northern Central America''. Oxford University Press, Oxford & New York. ] song
A song is a musical composition performed by the human voice. The voice often carries the melody (a series of distinct and fixed pitches) using patterns of sound and silence. Songs have a structure, such as the common ABA form, and are usu ...
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.
Range and habitat
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
vertebrate
Vertebrates () are animals with a vertebral column (backbone or spine), and a cranium, or skull. The vertebral column surrounds and protects the spinal cord, while the cranium protects the brain.
The vertebrates make up the subphylum Vertebra ...
s, large
insect
Insects (from Latin ') are Hexapoda, hexapod invertebrates of the class (biology), class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (Insect morphology#Head, head, ...
s, nectar, and
fruit
In botany, a fruit is the seed-bearing structure in flowering plants (angiosperms) that is formed from the ovary after flowering.
Fruits are the means by which angiosperms disseminate their seeds. Edible fruits in particular have long propaga ...
, including
banana
A banana is an elongated, edible fruit – botanically a berry – produced by several kinds of large treelike herbaceous flowering plants in the genus '' Musa''. In some countries, cooking bananas are called plantains, distinguishing the ...
s, ''
Cecropia
''Cecropia'' is a Neotropical genus consisting of 61 recognized species with a highly distinctive lineage of dioecious trees.
The genus consists of pioneer trees in the more or less humid parts of the Neotropics, with the majority of the speci ...
'' spikes,
gumbo-limbo (''Bursera simaruba'') and ''
Trophis racemosa'' (
Moraceae
Moraceae is a family of flowering plants comprising about 48 genera and over 1100 species, and is commonly known as the mulberry or fig family. Most are widespread in tropical and subtropical regions, less so in temperate climates; however, their ...
).
[*Foster, Mercedes S. (2007): The potential of fruiting trees to enhance converted habitats for migrating birds in southern Mexico. ''Bird Conservation International'' 17(1): 45-61.]
PDF fulltext
/ref> 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, 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
An egg is an organic vessel in which an embryo begins to develop.
Egg, EGG or eggs may also refer to:
Biology
* Egg cell, the female reproductive cell (gamete) in oogamous organisms
Food
* Eggs as food
Places
* Egg, Austria
* Egg, Switzerland ...
, and she incubates them without the male until they hatch in 15 days; the young fledge
Fledging is the stage in a flying animal's life between egg, hatching or birth and becoming capable of flight.
This term is most frequently applied to birds, but is also used for bats. For altricial birds, those that spend more time in vulnera ...
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.
Intraspecific relationships
Although the chestnut-headed oropendola
The chestnut-headed oropendola (''Psarocolius wagleri'') is a New World tropical icterid bird. The scientific name of the species commemorates Johann Georg Wagler, who established ''Psarocolius'', the oropendola genus.
Description
The male is ...
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 oropendola
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.
All the oropendolas are large bird ...
s 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
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 latte ...
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.
References
* Jaramillo, Alvaro & Burke, Peter (1999): ''New World Blackbirds''. Christopher Helm
Christopher Alexander Roger Helm (born Dundee, 1 February 1937 – 20 January 2007) was a Scottish book publisher, notably of ornithology related titles, including the ''Helm Identification Guides''.
Born in Dundee, he was raised in Forfar, wh ...
, London.
Further reading
*
External links
Montezuma Oropendola (''Psarocolius montezuma'')
- Dan Mennill's Bird Songs of the Yucatán Peninsula, with sonograms and recordings
* (for British Honduras
British Honduras was a Crown colony on the east coast of Central America — specifically located on the southern edge of the Yucatan Peninsula from 1783 to 1964, then a self-governing colony — renamed Belize from June 1973 -(Belize
Belize is a country on the north-eastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a maritime boundary with Honduras to the southeast. P ...
), Mexico
Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...
, Nicaragua
Nicaragua, officially the Republic of Nicaragua, is the geographically largest Sovereign state, country in Central America, comprising . With a population of 7,142,529 as of 2024, it is the third-most populous country in Central America aft ...
) at bird-stamps.org
*
*
*
Sound recordings of Montezuma oropendolas at BioAcoustica
{{Taxonbar, from=Q934975
Montezuma oropendola
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 Guatemal ...
Birds of Mexico
Birds of Central America
Montezuma oropendola
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 Guatemal ...
Birds of Costa Rica
Birds of Honduras
Birds of Panama
Birds of Nicaragua
Birds of Guatemala
Birds of Belize
Taxa named by René Lesson