List of endemic birds of Borneo

Birds endemic to the island of Borneo

The island of Borneo, located in southeast Asia at the southern edge of the South China Sea, is home to one endemic bird family, three endemic bird genera and 61 endemic bird species. All but one of the latter are forest dwellers, with most restricted to the spine of hills and mountains running down the middle of the island. The avian endemism has been shaped by the island's geological history. Borneo sits on a continental shelf. During glacial periods, when water levels were lower, Borneo was linked with other islands on the shelf and with the Malay Peninsula in a large landmass known as Sundaland. This allowed bird species to move freely throughout the region until the waters rose again as the glaciers melted. Separated from their relatives by the sea, some of these species evolved over millennia into the endemics now found on the island. BirdLife International has designated the mountainous central spine of the island as an Endemic Bird Area (EBA) because of the number of endemic species found there, and has further designated several lowland regions and nearby islands as secondary EBAs. Habitat destruction is a major threat to Borneo's endemic birds, as forests are lost to palm oil plantations and timber harvesting.

Borneo is an island located in southeast Asia, on the continental shelf at the southern edge of the South China Sea. It lies south of the Philippines, west of Sulawesi, north of Java, and east of Peninsular Malaysia. With an area of , it is the world's third largest island. More than half of the island is lowlands, rising to less than However, a spine of mountains runs down much of the central portion of the island. These include Mount Kinabalu, which at is the tallest mountain between the Himalayas and West Papua. The island is shared by three countries: Indonesia, Malaysia, and Brunei. While the lowlands are the most productive habitat in terms of the number of bird species found there, the mountains are the seat of Borneo's endemism. This is in large part due to the island's geological history. During the Pleistocene, the world's polar caps repeatedly advanced and retreated, alternately locking vast amounts of water into ice, and releasing it back into the world's oceans. This caused the water level in the oceans to repeatedly rise and fall. During glacial periods, when water levels were at their lowest, much of the Sunda Shelf was exposed. This linked what are now discrete islands (including Borneo, Java, Sumatra, and a host of smaller islands) with the Malay Peninsula in one large landmass known as Sundaland. During periods when the shelf was exposed, birds could move freely across the whole landmass. When the waters rose again, these birds were cut off from their relatives, and evolved in isolation on the various islands. Temperatures were cooler overall during glacial periods, so montane birds (those generally restricted to the slopes of mountains) could move lower and spread across larger areas. During interglacial periods, they retreated to higher elevations and were separated again from other populations, including birds in the lowlands. Studies have shown that some endemic montane species are most closely related to species in Borneo's lowlands, while others are more closely related to montane species on other Sundaland islands.

The island is home to a single endemic family: Pityriaseidae, which contains a single endemic genus (Pityriasis) with a single endemic species, the Bornean bristlehead. In addition, the island holds two other endemic genera, both of which are also monotypic: Chlamydochaera (the fruithunter) and Haematortyx (the crimson headed partridge). Two other monotypic genera formerly considered to be endemic to the island—Chlorocharis and Oculocincta—have since been merged into more widespread genera. Chlorocharis was merged into the large white eye genus Zosterops after molecular studies showed it nested comfortably within that genus. The same studies showed that Oculocincta was embedded within the smaller white eye genus Heleia, leading it to be moved as well. There are 61 endemic bird species on Borneo, according to the taxonomy proposed by the International Ornithologists' Union. Nearly all of these are forest birds; only the dusky munia is not. In all, roughly 10% of Borneo's forest birds are endemic to the island. Of these, 60% are montane species, 30% are found on lower slopes, and 10% are lowland species. However, Borneo's forests are under threat, particularly in the lowlands. Nearly 40% of the island's forests had been completely cleared by 2016, and another 34% had been selectively logged. Some 80% of Kalimantan's forests have been sold to timber concessions. Much of the original lowland forest has been converted to palm oil plantations; these now cover more than 32% of Kalimantan's lowland area. This results in a huge loss of biodiversity. While the original dipterocarp forests are home to more than 220 bird species, for example, palm plantations support only about 14 resident species. Some 80% of Kalimantan's forests have been opened up to timber concessions, even in protected areas. Many highland forests fall into protected areas—including national parks and forest reserves—but such gazetting does not always guarantee true protection, with logging occurring even in those areas.

Birdlife International defines Endemic Bird Areas (EBAs) as places where the breeding ranges of two or more range restricted species—those with breeding ranges of less than —overlap. In order to qualify, the whole of the breeding range of at least two range restricted species must fall entirely within the EBA. Borneo has one such area. The Bornean mountains EBA (157) comprises of mountain ranges in Borneo's interior, at an altitude above in elevation. These mountains are found in all three countries which share the island. Two of Borneo's three endemic genera are found here; only the Borneo bristlehead is found at lower elevations. In total, 31 range restricted species occur within this EBA. BirdLife International has also designated five Secondary EBAs for Borneo: two smaller island groups and three areas on Borneo itself. Secondary EBAs are those which either include the breeding range of only a single range restricted species, or those which cover only part of a range restricted bird's breeding area. The North east Bornean islands secondary area (s097) includes a number of small islands off the northern and eastern coasts of Borneo. The grey imperial pigeon, which the International Union for Conservation of Nature (IUCN) considers to be a vulnerable species, is found on a dozen or so of the islands; the near threatened, range restricted Mantanani scops owl is more common and widespread on the small islands off Sabah. Both species also breed on small islands near the Philippines. Three designated Important Bird Areas (IBAs) fall within this area. The Sabah lowlands secondary area (s098) encompasses the lowlands of the Malaysian state of Sabah, at the northern end of Borneo. The breeding range of the white fronted falconet, a near threatened species, falls entirely within the area. Part of the breeding range of the white crowned shama is also included. The secondary area includes eight designated IBAs. The Kalimantan lowlands secondary area (s099) encompasses the lowland forest thought to contain the breeding range of the black browed babbler, a presumably threatened species rediscovered in 2020, more than 170 years after the only specimen was collected. There are no IBAs in this secondary area. The Bornean coastal zone secondary area (s100) includes mangroves, coastal forest, and scrub on the island's western and southern coasts. These lie in the Malaysian state of Sarawak, and the Indonesian provinces of Kalimantan Barat, Kalimantan Selatan and Kalimantan Tengah. Part of the breeding area of the range restricted Javan white eye is found here; the vulnerable species also breeds on the Javan coast. The secondary area includes one designated IBA. The Natuna Islands secondary area (s101) includes small islands in an archipelago located off the western coast of Borneo. The critically endangered and range restricted silvery pigeon occurs in very small numbers here; it also occurs on Sumatra and a few smaller islands just off Sumatra's coasts. One designated IBA lies within this zone.

+ Common name Picture Scientific name Habitat Notes 1 Hose's partridge Rhizothera dulitensis Hill and lower montane forest Vulnerable Also known as Dulit partridge. 2 Red breasted partridge Arborophila hyperythra Hill dipterocarp forest; lower and upper montane forest Least Concern Also known as Bornean partridge. 157 3 Crimson headed partridge Haematortyx sanguiniceps Hill dipterocarp forest; lower and upper montane forest Least Concern 157 4 Bulwer's pheasant Lophura bulweri Hill and lower montane forest Vulnerable 5 Bornean peacock pheasant Polyplectron schleiermacher Lowland and hill dipterocarp forest Endangered 6 Dulit frogmouth Batrachostomus harterti Hill dipterocarp forest; lower montane forest Near Threatened 157 7 Bornean frogmouth Batrachostomus mixtus Hill dipterocarp forest; lower montane forest Near Threatened 8 Bornean swiftlet Collocalia dodgei Upper montane forest Least Concern Sometimes considered to be a subspecies of the cave swiftlet or the glossy swiftlet. 9 Bornean ground cuckoo Carpococcyx radiceus Lowland primary dipterocarp and riverine forest Near Threatened 10 Mountain serpent eagle Spilornis kinabaluensis Upper montane forest Vulnerable 157 11 Whitehead's trogon Harpactes whiteheadi Lower and upper montane forest Near Threatened 157 12 Mountain barbet Psilopogon monticola Lower and upper montane forest Least Concern 157 13 Golden naped barbet Psilopogon pulcherrimus Upper montane forest Least Concern 157 14 Bornean barbet Psilopogon eximius Lower and upper montane forest Least Concern 157 15 Brown barbet Caloramphus fuliginosus Lowland dipterocarp forest and lower hill forest, swamp forest and kerangas forest Least Concern Sometimes known as the Bornean brown barbet. 16 White fronted falconet Microhierax latifrons Lowland dipterocarp forest Near Threatened s098 17 Hose's broadbill Calyptomena hosii Hill dipterocarp forest; lower montane forest Near Threatened 157 18 Whitehead's broadbill Calyptomena whiteheadi Lower and upper montane forest Least Concern 157 19 Bornean banded pitta Hydrornis schwaneri Lowland and hill dipterocarp forest Least Concern 20 Blue headed pitta Hydrornis baudii Lowland dipterocarp forest Vulnerable 21 Black crowned pitta Erythropitta ussheri Lowland dipterocarp forest Near Threatened 22 Blue banded pitta Erythropitta arquata Hill and lower montane forest, particularly bamboo groves Least Concern 23 Bornean bristlehead Pityriasis gymnocephala Lowland and hill dipterocarp forest Near Threatened 24 Bornean whistler Pachycephala hypoxantha Lower and upper montane forest Least Concern 157 25 Black oriole Oriolus hosii Lower and upper montane forest Near Threatened 157 26 Bornean black magpie Platysmurus aterrimus Lowland forest and swamp forest Least Concern Formerly considered to be a subspecies of the black magpie; split in 2021. 27 Bornean green magpie Cissa jefferyi Lower forest Least Concern 28 Bornean treepie Dendrocitta cinerascens Hill dipterocarp forest; lower and upper montane forest Least Concern 29 Charlotte's bulbul Iole charlottae Lowland and hill dipterocarp and peat swamp forests Near Threatened Sometimes considered to be a subspecies of the buff vented bulbul. 30 Bornean bulbul Rubigula montis Lower and upper montane forest Least Concern 31 Cream eyed bulbul Pycnonotus pseudosimplex Lowland and hill dipterocarp and peat swamp forests; lower montane forests Least Concern 32 Pale faced bulbul Pycnonotus leucops Upper montane forest Least Concern Sometimes considered to be a subspecies of the flavescent bulbul. 33 Bornean stubtail Urosphena whiteheadi Hill dipterocarp forest; lower and upper montane forest Least Concern 157 34 Friendly bush warbler Locustella accentor Upper montane forest Least Concern 157 35 Chestnut crested yuhina Staphida everetti Hill dipterocarp forest; lower and upper montane forest Least Concern 157 36 Pygmy white eye Heleia squamifrons Hill dipterocarp forest and lower montane forest Least Concern 157 37 Mountain blackeye Zosterops emiliae Upper montane forest Least Concern 157 38 Meratus white eye Zosterops meratusensis Montane forest Least Concern 39 Bare headed laughingthrush Melanocichla calva Lower and upper montane forest Least Concern 157 40 Black throated wren babbler Turdinus atrigularis Lowland dipterocarp forest Near Threatened 41 Black browed babbler Malacocincla perspicillata Probably lowland forest Data Deficient Rediscovered in 2020, more than 170 years after the only specimen was collected. s099 42 Mountain wren babbler Gypsophila crassa Lower and upper montane forest Least Concern 157 43 Bornean wren babbler Ptilocichla leucogrammica Lowland dipterocarp and peat swamp forests; kerangas forest Vulnerable 44 Chestnut hooded laughingthrush Pterorhinus treacheri Hill dipterocarp forest; lower and upper montane forests Least Concern 45 Everett's thrush Zoothera everetti Lower and upper montane forest Near Threatened 157 46 Fruithunter Chlamydochaera jefferyi Lower and upper montane forest Least Concern 157 47 White crowned shama Copsychus stricklandii Lowland and hill dipterocarp and peat swamp forests; lower montane forest Least Concern Sometimes considered to be a subspecies of the white rumped shama. 48 Dayak blue flycatcher Cyornis montanus Montane forest Least Concern Sometimes considered to be a subspecies of the hill blue flycatcher (aka Javan blue flycatcher). 157 49 Meratus blue flycatcher Cyornis kadayangensis Montane forest Near Threatened 157 50 Bornean blue flycatcher Cyornis superbus Lowland and hill dipterocarp forest Least Concern 51 Crocker jungle flycatcher Cyornis ruficrissa Montane forest Not recognised by IUCN Sometimes considered to be a subspecies of the Philippine jungle flycatcher. 157 52 Eyebrowed jungle flycatcher Vauriella gularis Lower and upper montane forest Least Concern 157 53 Bornean forktail Enicurus borneensis Streams in lower to upper montane forest Not recognised by IUCN Sometimes considered to be a subspecies of the white crowned forktail. 54 Bornean whistling thrush Myophonus borneensis Lower and upper montane forest Least Concern 55 Bornean leafbird Chloropsis kinabaluensis Lower and upper montane forest Least Concern 56 Yellow rumped flowerpecker Prionochilus xanthopygius Lowland, hill and lower montane forest Least Concern 57 Spectacled flowerpecker Dicaeum dayakorum Lowland and hill dipterocarp forest Data Deficient Described to science in 2019. 58 Black sided flowerpecker Dicaeum monticolum Hill dipterocarp forest; lower and upper montane forest Least Concern 157 59 Bornean spiderhunter Arachnothera everetti Lowland, hill, and lower montane forest Least Concern Sometimes considered to be a subspecies of streaky breasted spiderhunter. 60 Whitehead's spiderhunter Arachnothera juliae Lower and upper montane forest Least Concern 157 61 Dusky munia Lonchura fuscans Scrub, gardens, grasslands, and rice paddies Least Concern