I had an 8 day birding to trip in eastern China with a wonderful guide Lin Zhang based in Shanghai. He is perfectly fluent in English. We visited 5 different locales. His website is here. FYI making contact within China by email is a problem as the government blocks some email accounts coming in including gmail. So I had to contact him using MS Outlook. His email is zhanglinas@hotmail.com.
The buntings in the Old World are in the same family with our New World sparrows. A few of them show up in North America as vagrants. In general, these birds appear to be more brightly colored than our sparrows.
The 6" Rustic Bunting (Emberiza rustica) is in the Sibley guide as the only one to appear regularly in North America. The male has a mostly black head with a crest and white stripe above the eye.