Acorn Woodpecker (Melanerpes formicivorus) [XC475161]
by Thomas Magarian from William Finley NWR Headquarters, Benton County, Oregon, United States (call)
Acorn Woodpecker (Melanerpes formicivorus) [XC560602]
by Richard E. Webster from Hunter Canyon, Cochise County, Arizona, United States (call)
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).