Bali myna
| Bali myna | |
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| At Brookfield Zoo, United States | |
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| Genus: | Leucopsar Stresemann, 1912
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| Species: | L. rothschildi
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| Leucopsar rothschildi Stresemann, 1912
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The Bali myna (Leucopsar rothschildi), also known as Rothschild's mynah, Bali starling, or Bali mynah, locally known as jalak Bali, is a medium-sized (up to 25 cm long), stocky myna, almost wholly white with a long, drooping crest, and black tips on the wings and tail. The bird has blue bare skin around the eyes, greyish legs and a yellow bill. Both sexes are similar. It is critically endangered and less than 100 adults are assumed to currently exist in the wild.
Taxonomy and systematics
Placed in the monotypic genus Leucopsar, it appears to be most closely related to Sturnia and the brahminy starling which is currently placed in Sturnus but will probably soon be split therefrom as Sturnus as presently delimited is highly paraphyletic.[2] The specific epithet commemorates the British ornithologist Lord Rothschild.
Description
The Bali myna is a medium-large bird of 25 cm. It is almost wholly white with a long, drooping crest, black wing-tips and tail tip. It has a yellow bill with blue bare skin around the eyes and legs. The black-winged starling (Sturnus melanopterus), a similar species, has a shorter crest and a much larger area of black on wings and tail, plus a yellow eye-ring (without feathers) and legs.[1]
Distribution and habitat
The Bali myna is restricted to the island of Bali in Indonesia, where it is the island's only endemic vertebrate species. (An endemic subspecies, the Bali tiger, has been extinct since 1937) The bird was discovered in 1910, and in 1991 was designated the faunal emblem of Bali. Featured on the Indonesian 200 rupiah coin, its local name is jalak Bali.
Behaviour and ecology
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In its natural habitat it is inconspicuous, using tree tops for cover and–unlike other starlings–usually coming to the ground only to drink or to find nesting materials; this would seem to be an adaptation to its noticeability to predators when out in the open. The Bali mynah often gathers in groups when it is young to better locate food and watch out for predators.[3] The vocalizations are a variety of sharp chattering calls and an emphatic twat.[1]
The Bali myna's diet includes fruit, seeds, worms and insects.[3]
Breeding
During the breeding season (the rainy season of Bali), males attract females by calling loudly and bobbing up and down. The birds nest in tree cavities, with the female laying and incubating two or three eggs. Both males and females bring food to the nest for chicks after hatching.[3]
Status and conservation
The Bali myna is critically endangered, and the wild population has been close to extinction since at least 1994. As of 2015, less than 100 adults are assumed to exist in the wild, with about 1,000 believed to survive in captivity. The Bali myna is listed in Appendix I of CITES. Trade even in captive-bred specimens is strictly regulated and the species is not generally available legally to private individuals. However, experienced aviculturalists may become affiliated with captive-breeding programs, allowing them to legally keep this species. The number of captive birds bought on the black market is estimated to be twice the number of legally acquired individuals in the captive breeding programs.[1]
There are currently three locations on Bali where the birds exist in the wild: the West Bali National Park; Bali's small island of Nusa Penida and Begawan Foundation's breeding site at Sibang adjacent to Green School.[1]
Bali myna breeding program
A "breeding loan" involves 12 breeders who each received 15 male and 15 female from the Association of Starling Conservationists from Bogor, West Java. As collateral every breeder should put up a cow in case all the birds died. The breeders are obliged to release 10 percent of the brood into the national park and the rest can be sold off privately.[4]
West Bali National Park
There were an estimated 350 birds in the West Bali National Park in the 1980s. During the 1990s over 400 cage-bred birds were released into the park to increase their numbers. But by 2005, the park authorities estimated the number to have fallen to less than 10. This decline was caused primarily by poachers responding to the lucrative demand for rare birds in the caged bird market.
Nusa Penida island
A population of Bali mynas now exists on the island of Nusa Penida and its sister islands of Nusa Ceningan, Nusa Lembongan, which are 14 km off the south east coast of Bali. The islands have been transformed into an unofficial bird sanctuary by Friends of National Parks Foundation (FNPF), an Indonesian NGO based in Bali.[5] This was achieved by FNPF working for many years with the 40+ villages on the islands and persuading every village to pass a traditional Balinese village regulation to protect birds, and effectively removing the threat of poachers. Since then, FNPF has rehabilitated and released several endangered birds onto the island of Nusa Penida, including many Bali mynas supplied from multiple breeders.[6]
The Begawan Foundation began its Bali Starling Breeding Program in Begawan Giri in 1999 with two pairs, which had grown to a population of 97 in 2005. A release program was started on Nusa Penida, where 64 individuals were released in 2006 and 2007. Monitoring of the released birds suggests that their numbers had increased to +100 by 2009, and had spread across Penida, with small numbers also breeding on Ceningan and Lembongan. A number of further captive-bred individuals have since been rewilded, including 6 individuals on neighboring Nusa Lembongan. The foundation expects to release approximately 10 Bali mynas each year. The birds will continue to be sourced from different breeders to increase the genetic diversity of the growing wild population on Nusa Penida. Begawan Foundation field staff have monitored the released birds on a daily basis since their release and have a dedicated Field Officer since 2010. Findings are regularly reported their findings to the Forestry Department, with photos and films taken of the birds' activities.[7]
However, according to an audit undertaken by Begawan Foundation on both Nusa Penida and Nusa Lembongan in February and March 2015, less than 15 birds were seen to be flying in the wild. Calculations undertaken suggest that by 2015, even taking natural predation and death of older birds into account, there should be at least 200 birds flying on Nusa Penida today, indicating that illegal wildlife trade is heavily impacting the population.[8]
Sibang, Central Bali
In 2010, Begawan Foundation made a decision to move all its captive breeding Bali starlings from Nusa Penida to a new site at Sibang, near Ubud. The breeding program then recommenced with the aim to research new release sites close by. During 2011, a total of 23 Bali starlings were donated to BF's breeding program. Three birds were donated by Jurong Bird Park, and 20 came from a variety of zoos across Europe, members of the European Endangered Species Program, whose contributions of birds meant that new genetic lines would be introduced when the imported birds were paired with the local birds held at the breeding centre in Bali.[citation needed]
In November 2012, Begawan Foundation released four pairs of Bali starlings at its breeding site in Sibang. These birds were observed and their daily habits recorded by staff of the Foundation and students of the adjacent Green School. A program of conservation was undertaken with the local villages prior to the release and has the full support of the King of Sibang. Each bird has been ringed in order to identify it as it adapts to life in the wild. As this was a soft release, the birds often take the opportunity to return to the breeding site to find food and water. However, it is evident that new sources of fruit and a variety of insects are available in the immediate vicinity that provide a full and healthy diet for these birds and their offspring.[9]
In 2014, there were three releases by Begawan Foundation at their site in Sibang. Three male birds and one female were released in April, with support from the local community. In June, Dr. Jane Goodall, during her visit to Bali, assisted in the release of two Bali starlings.[10]
Begawan Foundation has in place three foster parent schemes, where pairs are cared for offsite are in place, one in Sibang, one in Ubud and the third at Amankila, where it is hoped that a future release may be possible in the surrounding forested area.[citation needed]
References
- ^ a b c d e "Leucopsar rothschildi". IUCN Red List of Threatened Species. 2015. IUCN: e.T22710912A78289078. 2015. Retrieved 17 March 2016.
{{cite journal}}: Unknown parameter|authors=ignored (help) - ^ Jønsson, Knud A.; Fjeldså, Jon (2006). "A phylogenetic supertree of oscine passerine birds (Aves: Passeri)". Zoologica Scripta. 35 (2): 149–186. doi:10.1111/j.1463-6409.2006.00221.x.
- ^ a b c "Bali Mynah Fact Sheet, Lincoln Park Zoo"
- ^ Bali launches starling breeding program | The Jakarta Post
- ^ "Friends of the National Park Foundation".
- ^ "Bali Starling Conservation Project on Nusa Penida Island". Friends of the National parks Foundation.
- ^ "Begawan Foundation".
- ^ "Begawan Foundation Diary Vol.03/Mar 2015: Bird Audit".
- ^ "Rare Bali Starlings Released into New Environmental Context at Green School". Bali Discovery Tours.
- ^ "Jane Goodall visits Bali Myna conservation project to release birds". Birdwatch.co.uk.
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