Yong Ding Li is vice-chair of the Southeast Asian Biodiversity Society and committee member of the Nature Society (Singapore)'s bird group. He is currently pursuing a PhD in biodiversity conservation at the Australian National University. Ding Li has extensive field experience in Singapore and across Asia, and has published many research papers on birds, conservation and ecology. He also advises the IUCN SSC on Southeast Asian birds. Yu Yat-tung, born and living in Hong Kong, studied ecology at university and has been a passionate birdwatcher in Hong Kong and the neighbouring areas of China since 1988. He is a research manager of the Hong Kong Bird Watching Society, responsible for coordinating and managing their conservation projects. Yang Liu is an ornithologist based in Sun Yat-sen University, Guangzhou. He has a PhD in Ecology and Evolution in University of Bern, Switzerland. He has rich experience of birdwatching in China since 1994 and is responsible for editing the China Bird Report and the associated checklist of birds in China.