By DickDaniels (http://carolinabirds.org/) (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)
Asia. North and south China
Introduced but a scattered population does not seem to be self-sustaining. Reported from Suffolk, W Yorks, Norfolk, Gwynedd, Staffs and Derbys. At least 15 individuals were reported in 2014 from the Brecks but there was no evidence of breeding.