Acorn Woodpecker (Melanerpes formicivorus) [XC616747]
by Paul Marvin from South Fork Cave Creek Canyon, Chiricahua Mountains, Cochise County, Arizona, United States (alarm call)
Acorn Woodpecker (Melanerpes formicivorus) [XC780860]
by Isa\u00ed L\u00f3pez from , 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).