The Sumatran Laughingthrush (Garrulax bicolor) is an island endemic bird species from Indonesia. Its populations have rapidly decreased over the last decades and where the species was once widespread, only fragmented populations now remain. The species is protected on a national level and any capture or trade of wild individuals is strictly prohibited. Yet, illegal domestic trade continues to threaten the survival of this species. Less is known about the international trade in this species. Here, we investigate Sumatran Laughingthrush trade in the European Union (EU). We opportunistically observed 19 different websites from 2018 to 2020 and visited the Zwolle Bird Market in the Netherlands on four occasions in the same period. We found a minimum of 45 Sumatran Laughingthrushes for sale or in the possession of at least 20 dealers and/or hobbyists in Europe. At least some of these birds in private collections are likely to be, or have originated from, illegally imported wild individuals. In addition to the conservation implications of the trade in wild individuals, a potential increase in captive bred individuals on the international market in the future could hinder effective law enforcement, due to the difficulties of distinguishing between wild-caught and captive bred individuals. It is therefore essential to counter commercial captive breeding and trade while it is still in its infancy. We recommend that the EU lists this species in Annex A of the EU wildlife trade regulations and urge the Government of Indonesia to list the Sumatran Laughingthrush in CITES Appendix III, to assist in preventing international trade in illegally-sourced Sumatran Laughingthrushes globally.

苏门答腊笑画眉（双色Garrulax）是印度尼西亚的一种岛屿特有鸟类。在过去的几十年中，其种群数量迅速减少，该物种曾经广泛分布，现在只剩下零散的种群。该物种在国家一级受到保护，并且严禁任何野生个体的捕获或交易。然而，非法的国内贸易继续威胁着该物种的生存。人们对该物种的国际贸易知之甚少。在这里，我们调查了欧盟（EU）中的苏门答腊（Sumatran）Laughingthrush贸易。我们在2018年至2020年期间机会主义地观察了19个不同的网站，并在同一时期内四次访问了荷兰的Zwolle鸟类市场。我们在欧洲发现了至少45支苏门答腊笑眉毛出售或拥有，至少拥有20家经销商和/或业余爱好者。这些私人收藏中的鸟类中至少有一些可能是或源自非法进口的野生个体。除了野生个体贸易的保护意义外，由于难以区分野生捕获个体和圈养繁殖个体，将来国际市场上人工繁殖个体的潜在增加可能会阻碍有效的执法。因此，在尚处于起步阶段时，应对商业圈养和贸易至关重要。我们建议欧盟将该物种列入欧盟野生动植物贸易法规的附件A中，并敦促印度尼西亚政府在《濒危野生动植物种国际贸易公约》附录III中列出苏门答腊鹅口疮，以协助防止全球非法来源的苏门答腊鹅口疮的国际贸易。