A flock of raucous, escaped pet cockatoos living wild in Hong Kong’s urban parks may hold the genetic key to saving their critically endangered relatives back in Indonesia.
Researchers from the University of Hong Kong and the Kadoorie Farm and Botanic Garden discovered that the city’s feral population of yellow-crested cockatoos carries rare genetic variants that have disappeared from the species’ native range. That makes the Hong Kong birds an unexpected reservoir of diversity for a species on the brink.
A pet trade accident becomes a conservation asset
Yellow-crested cockatoos are native to Indonesia and East Timor, but their numbers have collapsed due to illegal trapping for the pet trade and habitat loss. The species is now listed as critically endangered by the International Union for Conservation of Nature.
Hong Kong’s population of roughly 200 birds started from escaped or released pets. They have established themselves in places like Hong Kong Park and the Hong Kong Zoological and Botanical Gardens, where they are a familiar sight to locals. The birds are considered an invasive species by the government, but the new study suggests they could play a positive role.
Genetic surprises hidden in a city flock
The research team compared DNA from Hong Kong’s cockatoos with samples from wild populations in Indonesia. They found that the Hong Kong birds contain genetic material that is no longer present in the native populations, likely because those variants were lost as the Indonesian birds were heavily poached.
This means the feral flock is not just a copy of the original population. It holds unique genetic information that could help the species adapt to changing environments or resist disease. The study was published in the journal Current Biology.
Local conservationists have long viewed the cockatoos as a nuisance because they compete with native birds for nesting holes. But the new findings have shifted the conversation. Some experts now argue that Hong Kong’s cockatoos should be protected rather than removed, and that they could serve as a source for reintroduction programs in Indonesia.
The discovery highlights how urban wildlife, often dismissed as invasive, can sometimes carry unexpected value. In this case, a city’s escaped pets may offer one of the last genetic lifelines for a species vanishing from its own homeland.
