Justification of Red List Category
This stunning starling qualifies as Critically Endangered because it has an extremely small range and a tiny population which is still suffering from illegal poaching for the cagebird trade. Releases of captive-bred birds have boosted the population, but it is uncertain how many of these have yet bred successfully in the wild. In due course, if the population continues to grow and trapping pressures can be brought under control, the species may warrant downlisting.
There were an estimated c. 50 individuals in the West Bali National Park in 2008 (Dijkman in litt. 2008). On Nusa Penida, the population was recorded as 65 adults and 62 juveniles in 2009 (C. Kenwrick in litt. 2009). However, given that the population estimate should only comprise of mature individuals, and the IUCN stipulates re-introduced individuals must have produced viable offspring before they are counted as mature individuals, the current population of 115 individuals should be considered a maximum, and as such the population is precautionarily assumed to be fewer than 50 individuals and mature individuals.
The wild population has been maintained only by release of captive birds, so is essentially gradually declining. However, signs from the reintroduced colony on Nusa Penida and West Bali National Park are promising, with both populations breeding and apparently increasing.
This species is endemic to the island of Bali, Indonesia, where it formerly ranged across the north-west third of the island. It has perhaps long been uncommon (numbers in the early 1900s, the period of discovery, have been retrospectively guessed at 300-900, although this is thought to be a gross underestimate), but has declined drastically in population and range. Illegal poaching reduced numbers to a critically low level in 1990, when the wild population was estimated at c. 15 birds. Conservation intervention coupled with the release of a few captive-bred birds raised this to between 35 and 55. However, despite excellent breeding success and continuing conservation efforts, the population continues to fluctuate and fell to six birds in 2001 (P. Benstead verbally 2003). Continuing releases have raised numbers in West Bali National Park, such that surveys in March 2005 found 24 individuals (P. Wood in litt. 2005) and in 2008 the population here was believed to be around 50 birds (G. Dijkman in litt. 2007, 2008). However, it is uncertain how many of these released birds have bred successfully in the wild and therefore can be regarded as mature individuals following IUCN guidelines. A population has been introduced on Nusa Penida Island (apparently not part of the native range) derived from captive individuals. The population appears to have adapted to the island and is breeding, with a total of 65 adults and 62 young present in 2009 (G. Dijkman in litt. 2007, 2008). Around 1,000 individuals are believed to survive in captivity. There was an apparent sighting of a pair of birds in East Java, but this has not been confirmed and is likely to be escaped or released captive birds (A. Blakemore in litt. 2011).
In the breeding season (usually October and November), it inhabits fire-induced open shrub, tree and palm-savanna and adjacent closed-canopy monsoon-forest (tropical moist deciduous), below 175 m. In the non-breeding season, birds disperse into open forest edge and flooded savanna woodland. In the past they also occurred, and even nested, in coconut groves near villages. Previously thought to rely on cavities excavated and vacated by other birds, released individuals on Nusa Penida have nested in sugar palm, coconut and fig trees (G. Dijkman in litt. 2007, 2008).
Its decline to virtual extinction in the wild is primarily attributable to unsustainable, illegal trapping in response to worldwide demand for the cage-bird trade. This threat continues despite the fact that the whole population is now confined within a national park and has been the subject of a specific conservation programme. The park and programme have, however, suffered from repeated mismanagement and corruption. In 1999, while black-market prices soared (US$2,000 in mid-1990s), an armed gang stole almost all the 39 captive individuals in the park awaiting release into the wild. These serious problems are compounded by habitat loss. With the population now at such a critically low level, other threats may include genetic erosion, interspecific competition, natural predation and disease. Trapping is recently suspected to have taken place among the released population at Nusa Penida (M. Halaouate in litt. 2013). In February and March 2015, staff of Begawan Foundation and Wildlife Reserves Singapore undertook an audit on both Nusa Penida and Nusa Lembongan, which only found 12 adults and a possible 2 birds in nests were sighted (Halaouate 2015).
Conservation and Research Actions Underway
CITES Appendix I. The species has been protected under Indonesian law since 1970, while the remaining wild population occurs entirely within Bali Barat National Park. Since 1983, the Bali Starling Project has helped to improve the guarding of the park, bolstered the wild population through release of captive-bred birds, and provided the foundation for the development of the Bali Starling Recovery Plan. A population was introduced to Nusa Penida Island (apparently not part of its native range) by Begawan Foundation, derived from captive individuals. Reintroduction has continued through the work of the Friends of the National Park Foundation (I. G. N. Bayu Wirayudha in litt. 2012). By the end of 2009 65 birds had been released at Nusa Penida and at least 62 chicks were reported to have fledged in the wild up to 2011 (Collar et al. 2012). In 2006 a local regulation was passed to make protection of birds obligatory by all village residents on Penida, in return for support including local education and sustainable livelihoods projects (Friends of the National Parks Foundation undated). A government scheme allows locals to get captive birds on 'breeding loan' and give a small proportion of the offspring to Bali Barat National Park and sell the rest commercially (Collar et al. 2012). As many as 126 birds have been released in the park, but these have been 'hard releases' with no monitoring of survival (Collar et al. 2012). In addition, the Wildlife Conservation Society continues to operate wildlife crime market/trade surveillance and enforcement at key trading hubs in Indonesia (N. Brickle in litt. 2007). Soft releases with provision of food, water and nest boxes have recently taken place at four resorts along the north coast (Collar et al. 2012). Three more releases were scheduled for 2014 (Begawan Foundation 2014).
Conservation and Research Actions Proposed
Continue to monitor population trends closely, in particular to determine whether released birds are breeding successfully. Improve genetic diversity of released populations by introducing unrelated individuals. Commence strict implementation of the Bali Starling Recovery Plan. Continue to monitor the success of the release on Nusa Penida, in particular investigating interactions with native flora and fauna, as well as those with local agricultural activity. Encourage community work to improve habitat conditions (I. G. N. Bayu Wirayudha in litt. 2012).
25 cm. Medium-large, stocky starling. Almost wholly white with long, drooping crest, black wing-tips and tail tip. Blue bare skin around eye and legs, yellow bill. Similar spp. Black-winged Starling Sturnus melanopterus has shorter crest, much larger area of black on wings and tail and yellow eye-ring and legs. Voice Variety of sharp chattering calls and an emphatic twat.
Text account compilers
Benstead, P., Bird, J., Davidson, P., Derhé, M., Pilgrim, J., Symes, A., Tobias, J., Khwaja, N. & Wright, L
Benstead, P., Blakemore, A., Brickle, N., Dijkman, G., Wood, P., Kenwrick, C., Bayu Wirayudha, I. & Halaouate, M.
BirdLife International (2017) Species factsheet: Leucopsar rothschildi. Downloaded from http://www.birdlife.org on 19/10/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 19/10/2017.