HI ALL:
Here's a useful article about wagtail subspecies id.:
https://archive.westernfieldornithologists.org/archive/V29/29(3)%20p0180-p0198.pdf
sincerely
Ian Paulsen
Bainbridge Island, WA, USA
Visit my BIRDBOOKER REPORT blog here:
https://medium.com/the-birdbooker-report
https://birdbookerreport.blogspot.com/