I spent parts of two days at Rancho Las Damas in the Valle Centrales of Chihuahua, November 15-16. Two Sapsuckers were present at the ranch headquarters, a female Red-naped and a female Williamson's. Both were confiding and allowed close study. The soapberry trees were well decorated with sap wells and the birds had their favorite trees, well separated given the limited number of trees near the ranch headquarters. The Williamson's Sapsucker was a lifer for several people presenting at the workshop, and I said I'd share some photos.
Here's the Red-naped.