There are more than 10,000 regional checklists in Avibase, offered in 9 different taxonomies, including synonyms in dozens of languages. Each checklist can be viewed with photos shared by the birding community, and also printed as PDF checklists for field use.
The Sillem's Mountain Finch or Tawny-headed Mountain Finch (Leucosticte sillemi) is a species of finch in the Fringillidae family. It is found only in China and was only known from two specimens collected in 1929 from the Aksai Chin area of southern Xinjiang Autonomous Region. In 2012, it was confirmed that the bird had been photographed by a French nature photographer, 1500 km from the original collection location. Source: Wikipedia