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BirdingASIA 15 (2011): 51 51 NOTEBOOK A wintering Chinese Crested Tern Sterna bernsteini in eastern Indonesia CRAIG ROBSON On 4 December 2010 I was lucky enough to see what will probably turn out to be the rarest find of my entire life. During a Birdquest tour that I was leading to eastern Indonesia, I took the group to Lusaolate, a tiny islet off the north coast of Seram, to see a well-known population of Olive Honeyeater Lichmera argentauris. Soon after arrival, I noticed a roosting group of 30–40 Greater Crested Terns Sterna bergii on some rocks just off the beach. The flock was flushed by one of our group, but they returned later on. I scanned through the flock to see if I could add Lesser Crested Tern S. bengalensis to our trip list; I soon noticed a somewhat smaller, paler tern that stood out. Imagine my surprise when I fixed my scope on the bird, and realised that I was looking at an adult Chinese Crested Tern S. bernsteini—a species that had never been ‘observed by a birder’ on its wintering grounds, ever! I quickly got everyone onto the bird, and still had time to take a series of photos through the scope, before it flew off with a few Greater Crested Terns, and was briefly seen foraging offshore before disappearing around the island. The sighting obviously raises the question of how many more are wintering in this region, and birders should be encouraged to survey wintering groups of Greater Crested Terns around the numerous islands in the Seram Sea and perhaps even further south in the Banda Sea. With an estimated population of not more than 50, this Critically Endangered bird is China’s most threatened. The single greatest threat to its survival is egg collection by fishermen for food, which continues even though the breeding sites are within protected areas. First discovered in 1861, it was seldom seen and its breeding grounds remained unknown until 2000, when four adults and four chicks were found amongst a colony of other tern species on Matsu Island, off the Fujian coast in China. In 2004, it was discovered breeding on the Jiushan Islands and, at present, these and the Wuzhishan Islands in Zhejiang province are the only known breeding sites in the world. There is only one previous record from Wallacea, a single specimen collected at Kaoe, Halmahera on 22 November 1861 (Jansen 2008). Reference CRAIG ROBSON Jansen, J. (2008) Heinrich Bernstein. BirdingASIA 10: 103–107. Craig Robson 63 Stafford Street,Norwich,NR23BD,UK Email: craiger@ntlworld.com CRAIG ROBSON Plates 1 & 2. Chinese Crested Tern Sterna bernsteini with Greater Crested Terns S. bergii, Lusaolate, Indonesia, 4 December 2010.