HONG KONG — “Spiderman … Tom Holland,” two secondary school boys repeated to each other as they watched conservationist Harry Wong nimbly climb a tall tree at their school, St. Louis School, in downtown Hong Kong. On a humid September afternoon, Wong installed a nest box for yellow-crested cockatoos (Cacatua sulphurea) on a candlenut tree (Aleurites moluccanus). Equipped with a harness and ropes, he climbed up the tree, installed the box, and quickly rappelled down. Wong and Astrid Andersson, a biologist and postdoctoral researcher at the University of Hong Kong (HKU), are the dynamic duo behind HK Cockatoo Watch, a conservation project that seeks to protect the city’s feral yellow-crested cockatoos. Arborist and conservationist Harry Wong installs a nest box for yellow-crested cockatoos on a tree at St. Louis School on Sept. 7, 2026. Image by Yenni Kwok/Mongabay. Yellow-crested cockatoos are considered to be critically endangered, with fewer than 2,000 individuals remaining in their native range in eastern Indonesia and Timor-Leste. However, few people know that Hong Kong is home to the largest wild population of the species outside the two Southeast Asian countries. There are roughly 200 cockatoos in the city, or about 10% of the global wild population, believed to be descendants of released or escaped pets. The number is stable, thanks to the lack of natural predators and strict legal protection. A recent DNA analysis study by Andersson and her research team found that Hong Kong’s feral cockatoos have unexpectedly high genetic diversity and may be key…This article was originally published on Mongabay

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