The Vanishing Act
The Bali starling (Leucopsar rothschildi) is an almost entirely white bird, with black tips on its wings and tail and a ring of bare, blue skin around its eyes. Endemic to a small part of Bali, this bird was formally described by science in 1912. For decades, its population remained relatively stable, with several hundred individuals living in the monsoon forests and savanna of what is now West Bali National Park.
The bird's beauty led to its decline. Beginning in the 1960s, a surge in demand for the exotic pet trade led to widespread illegal poaching. Traffickers could sell a pair of Bali starlings for sums that exceeded a park ranger's annual salary. This intense pressure, combined with habitat loss, caused the wild population to plummet. By 1990, only about 13 wild birds remained. Despite conservation efforts, the decline continued until a catastrophic low point was reached in 2001: just six individuals were known to exist in the wild.
Echoes of an Empty Ark
This collapse created one of the most severe genetic bottlenecks ever documented. Every Bali starling alive today, both in the wild and in captivity, is descended from a tiny number of founders. This drastic reduction in population size purged the species of its genetic diversity, leaving it vulnerable to disease and inbreeding depression. Studies of the Bali starling's DNA show low genetic variation, a direct consequence of the population crash.
Captive breeding programs became the species' only hope. Zoos and conservation organizations, such as the Begawan Foundation and Friends of the National Parks Foundation, worked to breed the birds. Reintroduction efforts began, but early attempts were hampered by continued poaching—many released birds were quickly trapped again.
A turning point came with a new strategy: creating a sanctuary on the nearby island of Nusa Penida, away from the bird's native habitat but safer from poachers. In 2006, 64 captive-bred birds were released there. Conservationists worked with local villages to establish traditional laws, or "awig-awig," which impose social penalties for harming the starlings. This community-based protection proved highly effective. The population on Nusa Penida grew, and similar community-led programs have since been established in several villages on mainland Bali. As of 2021, the total wild population was estimated at approximately 520 birds, a recovery from the brink of extinction.