Hong Kong Builds Nests for 200 Rare Cockatoos

When students at St. Louis School in Hong Kong spotted a pair of rare cockatoos trying to carve out a home in a tree on campus, they didn't just watch. They called in conservation experts who installed artificial nest boxes that are now saving one of the world's most threatened parrot species.

The yellow-crested cockatoo is critically endangered, with fewer than 2,000 birds remaining in their native Indonesia and Timor-Leste. Hong Kong hosts about 200 of these striking birds, descendants of escaped or released pets that now represent a tenth of the entire global population.

But city life created an unexpected problem. Storm damage and tree pruning have wiped out more than 60% of the natural tree hollows these footlong birds need to nest and raise their chicks.

"In the city, they do not have that luxurious choice available," said Astrid Andersson, a biologist at the University of Hong Kong. She described the shortage as "a housing crisis for these birds."

Andersson teamed up with arborist Harry Wong to launch HK Cockatoo Watch. Together they adapted Australian nest box designs for Hong Kong's humid climate, adding internal cameras to monitor breeding behavior remotely.

"What I am doing is to find a way: How can we coexist with them?" said Wong, who previously spent years working in bee conservation.

Since March 2025, the team has installed 15 nest boxes across public parks and school campuses. Four boxes are already occupied by cockatoo pairs, and students have become active participants in urban wildlife observation.

The project scored its first major success in May when a baby cockatoo found inside an apartment air conditioning vent was placed in an artificial nest nearby. The parents found their chick and raised it to full maturity.

"The parents were able to feed him and bring him from a tiny little baby to a fully fledged bird," Andersson said.

The Ripple Effect

Students are now drawing the birds for orientation booklets and photographing them during recess, turning schoolyards into living science labs. Visual arts teacher Winster Wong said watching the cockatoos attempt to build a nest on campus sparked immediate student interest in protecting local wildlife.

Recent genetic testing shows Hong Kong's cockatoos retain high genetic diversity despite their small population. Researchers believe protecting these urban birds could provide a vital genetic lifeline for restoring wild populations back in Southeast Asia, where habitat loss and illegal pet trade have devastated numbers.

Wong continues refining the nest box designs to reduce internal temperatures and improve nesting conditions. As more boxes go up across the city, Hong Kong is proving that urban spaces can become sanctuaries for even the rarest wildlife when communities decide to make room.