The Palawan fairy-bluebird (''Irena tweeddalii'') is a species of

bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

in the family

Irenidae 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 le ...

. It is native to

Balabac Island Balabac Island is the southernmost island of Palawan province, and therefore the westernmost undisputed island in the Philippines, some north of Sabah, Malaysia, across the Balabac Strait. Administratively, the island forms the main part of th ...

Palawan Palawan (, ), officially the Province of Palawan (; ), is an archipelagic province of the Philippines that is located in the region of Mimaropa. It is the largest province in the country in terms of total area of . The capital and largest c ...

and the

Calamian Islands The Calamian Islands or the Calamianes is a group of islands in the province of Palawan, Philippines. It includes: * Busuanga Island * Coron Island * Culion Island * Calauit Island * Malcapuya Island * Banana Island * Pass Island * Calumbuyan ...

in the

Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...

. Its natural

habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...

s are tropical moist lowland forest and it is declining due to

habitat destruction Habitat destruction (also termed habitat loss or habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved elsewhere, or are dead, leading to a decrease ...

and

deforestation Deforestation or forest clearance is the removal and destruction of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. Ab ...

Description and taxonomy

EBird eBird is an online database of bird observations providing scientists, researchers and amateur naturalists with real-time data about bird distribution and abundance. Originally restricted to sightings from the Western Hemisphere, the project e ...

describes the bird as "Spectacular forest-dweller with blood-red eyes, endemic to Palawan and surrounding smaller islands. Gathers at fruiting and flowering trees. Frequently gives rising “wit!” notes, often in bursts of three, as well as incorporating them into short, melodious song." Exhibits sexual dimorphism in which male are midnight black and electric blue while the female is dark turquoise with dark wingtips. It was formerly conspecific with the

Asian fairy-bluebird The Asian fairy-bluebird (''Irena puella'') is a medium-sized, arboreal passerine bird. This fairy-bluebird is found in forests across tropical southern Asia, Indochina and the Greater Sundas. Two or three eggs are laid in a small cup nest in a t ...

but split due to plummage differences with males have a lighter more electric blue versus the darker blue of the former. Females are duller and more turquiose in color. It has been observed feeding on invertebrates but otherwise diet is largely unknown. It is often seen foraging alone or in pairs foraging in the understorey.

Ecology and behavior

This specific species diet and breeding ecology has yet to be comprehensively studied but its diet is pressumed to be very similar to the

which mainly feeds on berries, figs and nectar. It also supplements its diet with some insects. Forms small flocks and also joins mixed species flocks of insectivores to forage. The Asian fairy-bluebird nests 2 to 6 meters high in palms. The nest is small and shallow cup made of flimsily arranged twigs and is typically built by the female. Clutch size of 2, occasionally 3, eggs.

Habitat and conservation status

The species inhabits tropical moist lowland

primary forest An old-growth forest or primary forest is a forest that has developed over a long period of time without Disturbance (ecology), disturbance. Due to this, old-growth forests exhibit unique ecological features. The Food and Agriculture Organizati ...

and secondary forest up to 1,000 meters above sea level. It is assessed as

near threatened A near-threatened species is a species which has been Conservation status, categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature (IUCN) as that may be vulnerable to Endangered species, endangerment in the ne ...

under the

IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...

with populations believed to be decreasing due to habitat loss, deforestation, hunting and the cage bird trade. The whole of

was designated as a Biosphere Reserve; however, protection and enforcement of laws has been difficult and these threats still continue. It occurs in the protected area in

Puerto Princesa Subterranean River National Park The Puerto Princesa Subterranean River National Park is a protected area in the Philippines. The park is located in the Saint Paul Mountain Range on the western coast of the island of Palawan, about north of the city of Puerto Princesa, and c ...

References

Palawan fairy-bluebird The Palawan fairy-bluebird (''Irena tweeddalii'') is a species of bird in the family Irenidae. It is native to Balabac Island, Palawan and the Calamian Islands in the Philippines. Its natural habitats are tropical moist lowland forest and it is ...

Birds of Palawan Endemic birds of the Philippines

{{passeri-stub