World Bird List

Species factsheet
Ladder-backed Woodpecker (Dryobates scalaris)

Order: Dryobates scalaris
Family: Woodpeckers (Picidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
cactophilus sw USA to c and e Mexico
eremicus n Baja California (Mexico)
lucasanus s Baja California (Mexico)
soulei Cerralvo I.
graysoni Tres Marías Is. (off w Mexico)
sinaloensis w Mexico
scalaris s Mexico
parvus n Yucatán and Cozumel I. (se Mexico)
leucoptilurus Belize to n Nicaragua