acorn woodpecker

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A woodpecker (Melanerpes formicivorus) primarily of western North America and Central America, having a black, white, and red head and noted for storing large quantities of acorns.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A species of woodpecker native to the area between southwestern United States and Colombia, Melanerpes formicivorus.