Bearded Bellbird
Encyclopedia
The Bearded Bellbird, Procnias averano, also known as the Campanero or Anvil-bird, is a passerine
bird which occurs in tropical northern South America
.
There are two subspecies
; the nominate taxon
, P. a. averano, in northeastern Brazil
and P. a. carnobarba in Venezuela
, Trinidad
, extreme northeastern Colombia
, western Guyana
and far northern Brazil
.
occurs in humid forests and woodland. It is mainly resident, but some populations take part in altitudinal migration
s; breeding at altitudes of up to 1900 m (6250 ft) and spending the non-breeding season in the lowlands. It is a localised and uncommon bird in Venezuela, but is fairly common in Trinidad. The nominate Brazilian race
is relatively rare due to extensive habitat destruction in its range and heavy trapping for the cagebird trade, and as such is considered "vulnerable" by Brazilian environmental authority (IBAMA
) http://www.diagnostico.org.br/especies/especie.2006-05-01.3989191239.
Like other cotingas, the Bearded Bellbird has a broad hooked-tipped bill, rounded wings, strong legs and a striking appearance. The male is approx 28 cm 11 in long, and weighs 180 g (6½ oz). His plumage
is white or greyish-white apart from the black wings and warm brown head. He sports a grotesque "beard" of un-feathered, black stringy wattles.
The female is smaller, at approx. 27 cm (10½ in) and 130 g (4½ oz). Her upperparts are olive-green (duskier on the head), most of the underparts are yellow streaked with green, and the vent is pure yellow. She lacks the facial wattles ("beard"). Both sexes have dark eyes, a black bill and grey to black legs.
These arboreal bellbirds feeds entirely on fruit
and berries
, mainly taken on the wing. Lauraceae
and Burseraceae
are particularly favoured, and the young are fed regurgitated
Lauraceae by the female.
The males' advertising calls are a very loud dull Bock repeated every few seconds and a somewhat less loud, metallic hammering tonk-tonk-tonk-tonk. It sounds like a hammer rapidly hitting an anvil and is repeated 20-30 times. Additionally, a number of regional calls are known, e.g. an unmusical, almost hissing, bisset in southern Venezuela and a disyllabic teek-terong in northern Venezuela. Apparently, the last mentioned call is no longer heard in Trinidad. The female is essentially silent.
The single brown-mottled, light tan egg
is incubated entirely by the female, leaving the polygamous
male free to spend much of his time advertising with his distinctive songs. Laying season varies over its range; April-Nov. in Trinidad and May-Sep. in N. Venezuela. The first recorded egg was discovered near Cumaca, Trinidad, in the mid-1950s.
Passerine
A passerine is a bird of the order Passeriformes, which includes more than half of all bird species. Sometimes known as perching birds or, less accurately, as songbirds, the passerines form one of the most diverse terrestrial vertebrate orders: with over 5,000 identified species, it has roughly...
bird which occurs in tropical northern South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...
.
There are two subspecies
Subspecies
Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...
; the nominate taxon
Taxon
|thumb|270px|[[African elephants]] form a widely-accepted taxon, the [[genus]] LoxodontaA taxon is a group of organisms, which a taxonomist adjudges to be a unit. Usually a taxon is given a name and a rank, although neither is a requirement...
, P. a. averano, in northeastern Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
and P. a. carnobarba in Venezuela
Venezuela
Venezuela , officially called the Bolivarian Republic of Venezuela , is a tropical country on the northern coast of South America. It borders Colombia to the west, Guyana to the east, and Brazil to the south...
, Trinidad
Trinidad
Trinidad is the larger and more populous of the two major islands and numerous landforms which make up the island nation of Trinidad and Tobago. It is the southernmost island in the Caribbean and lies just off the northeastern coast of Venezuela. With an area of it is also the fifth largest in...
, extreme northeastern Colombia
Colombia
Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...
, western Guyana
Guyana
Guyana , officially the Co-operative Republic of Guyana, previously the colony of British Guiana, is a sovereign state on the northern coast of South America that is culturally part of the Anglophone Caribbean. Guyana was a former colony of the Dutch and of the British...
and far northern Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...
.
Description and behaviour
This cotingaCotinga
The cotingas are a large family of passerine bird species found in Central America and tropical South America. Cotingas are birds of forests or forest edges, which mostly eat fruit or insects and fruit. Comparatively little is known about this diverse group, although all have broad bills with...
occurs in humid forests and woodland. It is mainly resident, but some populations take part in altitudinal migration
Bird migration
Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...
s; breeding at altitudes of up to 1900 m (6250 ft) and spending the non-breeding season in the lowlands. It is a localised and uncommon bird in Venezuela, but is fairly common in Trinidad. The nominate Brazilian race
Race (biology)
In biology, races are distinct genetically divergent populations within the same species with relatively small morphological and genetic differences. The populations can be described as ecological races if they arise from adaptation to different local habitats or geographic races when they are...
is relatively rare due to extensive habitat destruction in its range and heavy trapping for the cagebird trade, and as such is considered "vulnerable" by Brazilian environmental authority (IBAMA
Ibama
Brazilian Institute of Environment and Renewable Natural Resources is the Brazilian Ministry of the Environment's enforcement agency...
) http://www.diagnostico.org.br/especies/especie.2006-05-01.3989191239.
Like other cotingas, the Bearded Bellbird has a broad hooked-tipped bill, rounded wings, strong legs and a striking appearance. The male is approx 28 cm 11 in long, and weighs 180 g (6½ oz). His plumage
Feather
Feathers are one of the epidermal growths that form the distinctive outer covering, or plumage, on birds and some non-avian theropod dinosaurs. They are considered the most complex integumentary structures found in vertebrates, and indeed a premier example of a complex evolutionary novelty. They...
is white or greyish-white apart from the black wings and warm brown head. He sports a grotesque "beard" of un-feathered, black stringy wattles.
The female is smaller, at approx. 27 cm (10½ in) and 130 g (4½ oz). Her upperparts are olive-green (duskier on the head), most of the underparts are yellow streaked with green, and the vent is pure yellow. She lacks the facial wattles ("beard"). Both sexes have dark eyes, a black bill and grey to black legs.
These arboreal bellbirds feeds entirely on fruit
Fruit
In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...
and berries
Berry
The botanical definition of a berry is a fleshy fruit produced from a single ovary. Grapes are an example. The berry is the most common type of fleshy fruit in which the entire ovary wall ripens into an edible pericarp. They may have one or more carpels with a thin covering and fleshy interiors....
, mainly taken on the wing. Lauraceae
Lauraceae
The Lauraceae or Laurel family comprises a group of flowering plants included in the order Laurales. The family contains about 55 genera and over 3500, perhaps as many as 4000, species world-wide, mostly from warm or tropical regions, especially Southeast Asia and South America...
and Burseraceae
Burseraceae
Burseraceae is a moderate-sized family of 17-18 genera and about 540 species of flowering plants. The actual numbers differ according to the time period in which a given source is written describing this family. The Burseraceae is also known as the Torchwood family, the frankincense and myrrh...
are particularly favoured, and the young are fed regurgitated
Regurgitation (digestion)
Regurgitation is the expulsion of material from the mouth, pharynx, or esophagus, usually characterized by the presence of undigested food or blood.Regurgitation is used by a number of species to feed their young...
Lauraceae by the female.
The males' advertising calls are a very loud dull Bock repeated every few seconds and a somewhat less loud, metallic hammering tonk-tonk-tonk-tonk. It sounds like a hammer rapidly hitting an anvil and is repeated 20-30 times. Additionally, a number of regional calls are known, e.g. an unmusical, almost hissing, bisset in southern Venezuela and a disyllabic teek-terong in northern Venezuela. Apparently, the last mentioned call is no longer heard in Trinidad. The female is essentially silent.
Nesting
The flimsy nest of twigs is built by the female and usually placed in the outer branches of a tree. The nests are not located in the jungle, but in free-standing trees in semi-cleared areas, probably to reduce the risk from the many effective predators of nests in the jungle such as monkeys, toucans and snakes.The single brown-mottled, light tan egg
Egg (biology)
An egg is an organic vessel in which an embryo first begins to develop. In most birds, reptiles, insects, molluscs, fish, and monotremes, an egg is the zygote, resulting from fertilization of the ovum, which is expelled from the body and permitted to develop outside the body until the developing...
is incubated entirely by the female, leaving the polygamous
Polygamy
Polygamy is a marriage which includes more than two partners...
male free to spend much of his time advertising with his distinctive songs. Laying season varies over its range; April-Nov. in Trinidad and May-Sep. in N. Venezuela. The first recorded egg was discovered near Cumaca, Trinidad, in the mid-1950s.
Further reading
- Snow, D.W. (1982). The Cotingas: Bellbirds, Umbrella birds and their allies. British Museum Press. ISBN 0-19-858511-X