Baya weaver

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Baya weaver
Baya weaver (Ploceus philippinus) Male Photograph by Shantanu Kuveskar.jpg
Baya weaver (Ploceus philippinus) female Photograph by Shantanu Kuveskar.jpg
Male and female P. p. philippinus (India)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Ploceidae
Genus: Ploceus
Species:
P. philippinus
Binomial name
Ploceus philippinus
Baya Weaver.jpg
     approximate distribution
Synonyms

Loxia philippinaLinnaeus, 1766

The baya weaver (Ploceus philippinus) is a weaverbird found across the Indian Subcontinent and Southeast Asia. Flocks of these birds are found in grasslands, cultivated areas, scrub and secondary growth and they are best known for their hanging retort shaped nests woven from leaves. These nest colonies are usually found on thorny trees or palm fronds and the nests are often built near water or hanging over water where predators cannot reach easily. They are widespread and common within their range but are prone to local, seasonal movements mainly in response to rain and food availability.

Contents

Among the population variations, five subspecies are recognized. The nominate race philippinus is found through much of mainland India while burmanicus is found eastwards into Southeast Asia. The population in southwest India is darker above and referred to as subspecies travancoreensis. [2]

Taxonomy

In 1760 the French zoologist Mathurin Jacques Brisson included a description of the baya weaver in his Ornithologie based on a specimen that he believed had been collected in Philippines. He used the French name Le gros-bec des Philippines and the Latin Coccothraustes Philippensis. [3] Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. [4] When in 1766 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the twelfth edition, he added 240 species that had been previously described by Brisson. [4] One of these was the baya weaver. Linnaeus included a brief description, coined the binomial name Loxia philippina and cited Brisson's work. [5] It was subsequently realised that Brisson was mistaken in believing that his specimen came from the Philippines and the type locality was redesignated as Sri Lanka. [6] This species is now placed in the genus Ploceus that was introduced by the French naturalist Georges Cuvier in 1816. [7]

There are five subspecies: [8]

Description

These are sparrow-sized (15 cm [5.9 in]) and in their non-breeding plumage, both males and females resemble female house sparrows. They have a stout conical bill and a short square tail. Non-breeding males and females look very similar: dark brown streaked fulvous buff above, plain (unstreaked) whitish fulvous below, eyebrow long and buff coloured, bill is horn coloured and no mask. Breeding males have a bright yellow crown, dark brown mask, blackish brown bill, upper parts are dark brown streaked with yellow, with a yellow breast and cream buff below. [9]

Behaviour and ecology

Baya weavers are social and gregarious birds. They forage in flocks for seeds, both on the plants and on the ground. Flocks fly in close formations, often performing complicated manoeuvres. They are known to glean paddy and other grain in harvested fields, and occasionally damage ripening crops and are therefore sometimes considered as pests. [10] They roost in reed-beds bordering waterbodies. They depend on wild grasses such as Guinea grass ( Panicum maximum ) as well as crops like rice for both their food (feeding on seedlings in the germination stage as well as on early stages of grain [11] ) and nesting material. They also feed on insects (including butterflies [12] ), sometimes taking small frogs, [13] geckos [14] and molluscs, especially to feed their young. [15] Their seasonal movements are governed by food availability. Their calls are a continuous chit-chit-... sometimes ending in a wheezy cheee-eee-ee that is produced by males in a chorus. A lower intensity call is produced in the non-breeding season. [16]

They are occasionally known to descend to the ground and indulge in dust bathing. [17]

In captivity, individuals are known to form stable peck orders . [18]

Breeding

The breeding season of the baya weavers is during the monsoons. [2] The breeding condition is initiated by environmental characters such as day length and comes to an end late in summer. This post-reproductive "photorefractoriness", in which photoperiodic birds cease to respond reproductively to the stimulation of long days, can end spontaneously without having been exposed to short days for four to six months unlike temperate birds. [19] They nest in colonies typically of up to 20–30, close to the source of food, nesting material and water. Baya weavers are best known for the elaborately woven nests constructed by the males. These pendulous nests are retort-shaped, with a central nesting chamber and a long vertical tube that leads to a side entrance to the chamber. The nests are woven with long strips of paddy leaves, rough grasses and long strips torn from palm fronds. Each strip can be between 20 and 60 cm (7.9 and 23.6 in) in length. A male bird is known to make up to 500 trips to complete a nest. The birds use their strong beaks to strip and collect the strands, and to weave and knot them while building their nests. The nests are often built hanging over water [20] from palm trees [21] and often suspended from thorny Acacia s and in some cases from telephone wires. [22] [23] [24] [25] [26] Although the birds prefer thorny trees, they sometimes use avenue trees in urban areas. [27] Nests are often located on the eastern side of the tree, where they are believed to provide shelter from the Southwest Monsoon; however, late breeders are more likely to build their nests in other orientations relative to the trunk of the nest tree. [28] Abandoned nests are sometimes used by mice ( Mus booduga ) [29] and other birds such as munias. [30] [31]

Nests are built mainly in colonies but isolated nests are not unknown. [32] Nests are often built from thorny Acacia or palm trees ( mainly Phoenix sylvestris [33] ) and hang over open water. [18] Young males may build experimental nests among reeds. [34] In Burma, birds often build nests under the eaves of buildings, but this habit is uncommon in India. [35] The males take about 18 days to construct the complete nest with the intermediate "helmet stage" taking about eight days. [36] The nests are partially built before the males begin to display to passing females by flapping their wings and calling while hanging from their nests. The females inspect the nest and signal their acceptance of a male. Once a male and a female are paired, the male goes on to complete the nest by adding the entrance tunnel. Males are almost solely in charge of nest building, though their female partners may join in giving the finishing touches, particularly on the interiors. Females may modify the interiors or add blobs of mud. [37] A study has found that nest location is more important than nest structure for the female when it selects the nest and mate. [38] Females prefer nests high in trees, those over dry land, and those on thin branches. [39]

Both males and females are polygamous. Males build many partial nests and begin courting females. The male finishes the nest only after finding a mate. The female lays about two to four white eggs and incubates them for about 14 to 17 days. [40] Males may sometimes assist in feeding the chicks. The chicks leave the nest after about 17 days. [16] After mating with a female the male typically court other females at other partially constructed nests. Intraspecific brood parasitism is known, that is, females may lay their eggs in the nests of others. [41] Young birds leave the nest in a juvenal plumage which is replaced in their first moult after about four to six months. The young disperse to new locations not far from their nest and young have been located up to two kilometres away from their origin. [42] Females are capable of breeding after a year while males take half a year longer. Prior to breeding they go through a prenuptial moult. Adults also go through a second moult after breeding and thus there are two moults each year. [43] Histochemical studies have shown increased lipid metabolism in the crown region of male Baya during the breeding season. Lipids are known to be involved in the transport of the yellow carotenoid pigments that form the crown and are subsequently metabolized. [44]

The nest, being suspended from thorny trees and overhanging water, is protected from many predators, but nest predation by crows is not unusual. Brood may also be destroyed by lizards such as Calotes versicolor [40] or rodents such as Vandeleuria oleracea which may take over the nest. [18] Nests may sometimes be taken over and used for nesting by munias and Indian silverbills (Euodice malabarica). [45]

In culture

A widespread folk belief in India is that the baya sticks fireflies with mud to the nest walls to light up the interior of the nest at night. [46] Clay, however is known to be used in the nests of baya weavers. Males alone have been seen to add blobs of mud and dung to the nest chamber prior to pairing with a female. [46] It has been suggested that the clay may help to stabilise the nest in strong winds. [47]

In earlier times, the baya weaver was trained by street performers in India for entertainment. They could pick up objects at the command of their trainers. [48] They were trained to fire toy cannons, string beads, pick up coins and other objects. According to Edward Blyth "the truth is, that the feats performed by trained Bayas are really very wonderful, and must be witnessed to be fully credited. Exhibitors carry them about, we believe, to all parts of the country; and the usual procedure is, when ladies are present, for the bird, on a sign from its master, to take a sweetmeat in its bill, and deposit it between a lady's lips, and repeat this offering to every lady present, the bird following the look and gesture of its master. A miniature cannon is then brought, which the bird loads with coarse grains of powder...." Robert Tytler noted demonstrations where the bird would twirl a thin stick with fires at the ends over its head. [49] These uses have been noted from the time of Akbar.

The baya is like a wild sparrow but yellow. It is extremely intelligent, obedient and docile. It will take small coins from the hand and bring them to its master, and will come to a call from a long distance. Its nests are so ingeniously constructed as to defy the rivalry of clever artificers.

— Āīn (trans. Jarrett), iii. 122. (ca. 1590) quoted in the Hobson Jobson [50]

Local names

Túkúra Sorai (Assamese: টোকোৰা চৰাই); baya, son-chiri (Hindi); bayya chirya (Urdu: بیّا چڑیا ); ବାୟା ଚଢ଼େଇ (Odia); sugaran (Marathi); tempua (Malay); sughari (Gujarati); বাবুই (babui) (Bengali); parsupu pita, gijigadu/gijjigadu గిజిగాడు (Telugu); gijuga ಗಿಜುಗ (Kannada); thukanam kuruvi, ആറ്റക്കുരുവി (Malayalam); [51] thukanan-kuruvi, தூக்கணாங்குருவி (Tamil); wadu-kurulla, tatteh-kurulla, goiyan-kurulla (Sinhala); sa-gaung-gwet, sar-buu-daung စာဗူးတောင်း (Burmese); bijra (Punjabi: ਬਿਜੜਾ ); suyam (Chota Nagpur), bagra(Maithili). [52] संस्कृतम् (सुगृहः/चञ्चूसूचकः) Marathi (सुगरण पक्षी)

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References

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  41. ↑ Dhindsa, M.S. (1990). "Intraspecific brood parasitism in the Baya Weaverbird (Ploceus philippinus)". Bird Behavior. 8 (2): 111–113. doi:10.3727/015613890791784326.
  42. ↑ Mathew, D.N. (1972). "The ecology of the Baya in Rajampet, Cuddapah Dt., Andhra Pradesh". J. Bombay Nat. Hist. Soc. 69 (1): 188–191.
  43. ↑ Mathew, D.N. (1977). "Moult in the Baya Weaver Ploceus philippinus Linnaeus". J. Bombay Nat. Hist. Soc. 74 (2): 233–245.
  44. ↑ Narasimhacharya, A. V. R. L. & Kotak, V. C. (1989). "Histochemical observations on the crown skin of male baya: Lipids, lipase and phosphomonoesterases". J. Biosci. 14 (4): 385–390. doi:10.1007/BF02703424. S2CID   45180353.
  45. ↑ Dhindsa, M. S.; Sandhu, P. S. (1988). "Response of the Baya Weaverbird (Ploceus philippinus) to eggs of the White-throated Munia (Lonchura malabarica): relation to possible incipient brood parasitism". Zool. Anz. 220: 216–222.
  46. 1 2 Davis,T. Antony (1973). "Mud and dung plastering in Baya nests". J. Bombay Nat. Hist. Soc. 70 (1): 57–71.
  47. ↑ Wood, C. A. (1926). "The nest of the Baya weaver bird" (PDF). The Auk. 43 (3): 295–302. doi:10.2307/4075422. JSTOR   4075422.
  48. ↑ Khan, At'har Ali (1799). "On the Baya, or Indian Gross-beak". Asiatic Researches. 2: 109–110.
  49. ↑ Duncan, Peter Martin, ed. (1894). Cassell's Natural History. Volume IV. London: Cassell and Company. p. 103.
  50. ↑ Yule, Henry (1903). William Crooke (ed.). Hobson-Jobson: A glossary of colloquial Anglo-Indian words and phrases, and of kindred terms, etymological, historical, geographical and discursive (New ed.). J. Murray, London.
  51. ↑ "Baya Weaver". Archived from the original on 2017-06-30. Retrieved 2017-06-12.
  52. ↑ Anonymous (1998). "Vernacular Names of the Birds of the Indian Subcontinent" (PDF). Buceros. 3 (1): 53–109.

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