Leafbird

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Leafbirds
Golden Fronted Leafbird Mukulhinge.jpg
Golden-fronted leafbird (Chloropsis aurifrons)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Chloropseidae
Wetmore, 1960
Genus: Chloropsis
Jardine & Selby, 1827
Species

See text

Leafbird Leafbird-Female.jpg
Leafbird

The leafbirds (Chloropseidae) are a family of small passerine bird species found in the Indian Subcontinent and Southeast Asia. They were formerly grouped with the ioras and fairy-bluebirds in the family Irenidae. As presently defined, the leafbird family is monogeneric, with all species placed in the genus Chloropsis. A large molecular phylogenetic study published in 2019 found that the family Chloropseidae is sister to the family Irenidae containing the fairy-bluebirds. [1]

Contents

Description

The leafbirds range in size from 14 to 21 cm (5.5–8.3 in), and in weight from 15 to 48 g (0.53–1.69 oz). [2] They resemble bulbuls, but whereas that group tends to be drab in colour, leafbirds are brightly plumaged, with the predominant green over the body giving rise to their common name. The family is mostly sexually dimorphic in their plumage, this can vary from the highly dimorphic orange-bellied leafbird to the Philippine leafbird, which exhibits no sexual dimorphism. Most of the differences between the sexes are in the extent of the other colours in the plumage, particularly in the colours around the head and the blue or black face mask, with females having less colour and a less extensive (or absent) mask. [2] Some species have blue on the wings and tail. The plumage of juvenile birds is a duller version of the female's. To human ears, their songs are melodious, and several species are good mimics. The calls include whistles and chatters. [3]

Like bulbuls, leafbirds drop many body feathers when they are handled. This may confuse predators, especially snakes. [3]

Distribution and habitat

Leafbirds are always found in trees and shrubs. Most are restricted to evergreen forests except the golden-fronted leafbird and Jerdon's leafbird which live in deciduous monsoon forests, and the orange-bellied leafbird, which occurs in deciduous forests. Within this requirement, they occupy all broadleaf forest types in the Indian Subcontinent and Southeast Asia. The highest altitude they occur at is 2500 m (8200 feet). [3] Some species, such as the blue-masked leafbird, have montane distributions, rarely descending below 1000 m. [2]

The orange-bellied leafbird and the golden-fronted leafbird are amongst the more widespread species, with large ranges across mainland Asia. Some species have more restricted distributions, such as the yellow-throated leafbird, which is endemic to the Philippine island of Palawan, and the Bornean leafbird, restricted to northern Borneo. In general there are seldom more than three species occurring in the same area, although five species co-occur in the submontane forests of Sumatra. Co-occurring species are usually well-spaced on the spectrum of size, to reduce competition. [2]

Behaviour

The yellow-throated leafbird is endemic to Palawan in the Philippines Lemon-throated-leaf-birdtrek.jpg
The yellow-throated leafbird is endemic to Palawan in the Philippines

Leafbirds usually feed in the canopy, eating insects and some fruit and nectar. Prey is searched for by nimbly moving along the branch ends and gleaned. They are also capable of hover-gleaning to obtain prey, and will pursue flushed prey into the air or even as far as the forest floor. The extent to which the leafbirds consume nectar is a matter of some debate; records are more common in Southern Asia compared to South East Asia. [2] Some species join mixed feeding flocks now and then; others defend the blooming and fruiting trees and bushes where they forage. [3]

Unlike most tropical Asian passerines, the nests of leafbirds are not located low down in the forest, but are instead found on the ends of branches near the tree crown. As such the nests of many species have rarely, if ever, been seen. The nests are open cups; of the few known, they are built of fine stems, leaf parts and rootlets. [2] Some hang from thin horizontal shoots of trees; in others the rim is attached to a pair of vertical twigs. Females lay 2 or 3 pinkish eggs. [3] The only information for incubation times comes from captive birds, and incubation lasts around 14 days. Incubation is apparently performed only by the female, although in at least two species the male feeds the incubating females. [2]

Relationship with humans

Leafbirds are attractive birds and, combined with an attractive song and capacity to mimic sounds, they have become very popular cagebirds. The majority of the trade in this family is confined to Asia. Some populations have been locally depleted by the massive numbers captured for the trade. Overall the eleven species are mostly still common in suitable habitat, although the amount of suitable habitat has declined greatly with deforestation. Over half of leafbird species are either threatened or near threatened. The greater green leafbird, the blue-winged leafbird and the Sumatran leafbird are endangered because of trapping for the cage bird trade. One species, the Philippine leafbird, is listed as vulnerable due to habitat loss. The lesser green leafbird and the blue-masked leafbird are listed as near threatened. [2]

Species

The female blue-winged leafbird lacks the face mask of the male Chloropsis cochinchinensis -Singapore-8a.jpg
The female blue-winged leafbird lacks the face mask of the male
MaleFemaleCommon NameScientific nameDistribution
11 PHILIPPINE LEAFBIRD.jpg Philippine leafbird Chloropsis flavipennisPhilippines (Mindanao, Leyte, and Cebu)
Lemon-throated-leaf-birdtrek.jpg Yellow-throated leafbird Chloropsis palawanensisPhilippines (Palawan)
Greater Green Leafbird camouflage.jpg Chloropsis sonnerati-20030531.jpg Greater green leafbird Chloropsis sonneratiBrunei, Indonesia, Malaysia, Myanmar, Singapore, and Thailand.
Lesser Green Leafbird.png Lesser Green Leafbird (Female).jpg Lesser green leafbird Chloropsis cyanopogonBrunei, Indonesia, Malaysia, Myanmar, Singapore, and Thailand.
Blue-winged Leafbird - Thailand H8O5844 (16432256783).jpg Chloropsis cochinchinensis - Khao Yai.jpg Blue-winged leafbird Chloropsis moluccensis [4] Borneo and southern Sumatra.
Hijau Daun.jpg Javan leafbird Chloropsis cochinchinensis [4] Java.
Jerdon's Leafbird, Bengaluru, Vimal Rajyaguru, 01.jpg Chloropsis jerdoni -Bodhinagala Forest Reserve, Sri Lanka -female-8 (1) (cropped).jpg Jerdon's leafbird Chloropsis jerdoniIndia and Sri Lanka.
Bornean leafbird Chloropsis kinabaluensisBorneo
Golden Fronted Leafbird Mukulhinge.jpg Golden Fronted Leafbird.jpg Golden-fronted leafbird Chloropsis aurifronsIndian subcontinent and south-western China, to south-east Asia and Sumatra
Sumatran leafbird Chloropsis mediaIndonesia
Orange bellied leafbird.jpg Orange-bellied Leafbird Pangolakha Wildlife Sanctuary West Sikkim Sikkim India 13.12.2015.jpg Orange-bellied leafbird Chloropsis hardwickiicentral and eastern Himalayas, Yunnan and Southeast Asia.
Blue-masked leafbird Chloropsis venustaIndonesian island of Sumatra.

Related Research Articles

<span class="mw-page-title-main">Fairy-bluebird</span> Genus of birds

The three fairy-bluebirds are small passerine bird species found in forests and plantations in tropical southern Asia and the Philippines. They are the sole members of the genus Irena and family Irenidae, and are related to the ioras and leafbirds.

<span class="mw-page-title-main">Iora</span> Genus of birds

The ioras are a small family, Aegithinidae, of four passerine bird species found in south and southeast Asia. The family is composed of a single genus, Aegithina. They were formerly grouped with the leafbirds and fairy-bluebirds, in the family Irenidae.

<span class="mw-page-title-main">Passerida</span> Clade of birds

Passerida is, under the Sibley-Ahlquist taxonomy, one of two parvorders contained within the suborder Passeri. While more recent research suggests that its sister parvorder, Corvida, is not a monophyletic grouping, the Passerida as a distinct clade are widely accepted.

References

  1. Oliveros, C.H.; et al. (2019). "Earth history and the passerine superradiation". Proceedings of the National Academy of Sciences of the United States. 116 (16): 7916–7925. doi: 10.1073/pnas.1813206116 . hdl: 1808/30907 .
  2. 1 2 3 4 5 6 7 8 Wells, David (2005), "Family Chloropseidae (Leafbirds)", in del Hoyo, Josep; Elliott, Andrew; Christie, David (eds.), Handbook of the Birds of the World. Volume 10, Cuckoo-shrikes to Thrushes, Barcelona: Lynx Edicions, pp.  252–266, ISBN   84-87334-72-5
  3. 1 2 3 4 5 Mead, Christopher J.; Wells, D. R. (2003). "Leafbirds". In Perrins, Christopher (ed.). The Firefly Encyclopedia of Birds . Firefly Books. pp.  506–507. ISBN   1-55297-777-3.
  4. 1 2 "Species Updates – IOC World Bird List" . Retrieved 2021-05-27.