Acorn Woodpecker (Melanerpes formicivorus) [XC494256]
by Daniel Hinckley from Coconino National Forest (near Payson), Coconino County, Arizona, United States (song)
Acorn Woodpecker (Melanerpes formicivorus) [XC778477]
by Ed Pandolfino from Pinery Canyon, Chiricahua Mountains, Cochise County, Arizona, United States (call, drumming)
Nest
In a hole cut into the trunk of a tree.
Subspecies
Proposed subspecies martirensis (northern Baja California) considered indistinguishable from bairdi. Subspecies lineatus doubtfully distinct from albeolus.
The following 7 subspecies are recognised:
bairdi Ridgway, 1881 - North-western Oregon south to northern Baja California.
formicivorus (Swainson, 1827) - Arizona, New Mexico and western Texas south to south-eastern Mexico (west of Chiapas).