Hong Kong scientist working to save endangered cockatoos

A yellow-crested cockatoo is displayed for sale at a market in Dobo, Aru Islands, Indonesia, Wednesday, Nov. 26, 2014. (AP Photo/Dita Alangkara) Above the teeming shopping streets of Hong Kong's Causeway Bay district, a fight to save one of the world's most endangered species is unfolding high in the branches of a decades-old cotton tree. Nestled among its sprawling boughs is a nest box designed for the yellow-crested cockatoo, of which only 1,200 to 2,000 remain in the world. Although the birds are native to East Timor and Indonesia, one-tenth of those left are found in Hong Kong — one…