Throughout its range, this species is closely associated with oaks (genus Quercus) and is most commonly found in pine-oak woodlands.” Here in the Bay Area, acorn woodpecker colonies are fairly common in the East Bay hills and the western slopes of Mount Diablo, particularly where there are concentrations of valley oaks. This dataset represents a species known range extent for Acorn Woodpecker (Melanerpes formicivorus) within the conterminous United States (CONUS) based on 2001 ground conditions. and where they nest. U.S./Canada Population Estimate: 2,000,000 Population Trend: Increasing Habitat: Western forests with oaks Threats: Habitat loss, invasive bird species (European Starling), occasional hunting Note: In the fall, Acorn Woodpecker groups choose a “granary” tree into which they drill holes to store acorns.A single granary tree can sometimes hold up to 50,000 acorns. Call: loud wack-a , wack-a or ja-cob , ja-cob series. Acorn hoarded by acorn woodpecker Food and homes Acorn woodpeckers, as their name implies, depend heavily on acorns for food. In some parts of their range (e.g., California), the woodpeckers create granaries or "acorn trees" by drilling holes in dead trees, dead … The range defined by TBBAP data is essentially the equivalent of that defined by The Bird Life of Texas (Oberholser 1974). They live together in groups of up to 12 or more, and they nest and raise their broods communally. The Acorn Woodpecker has a large range of 1,500,000 square kilometers. Acorn Woodpecker. This includes oak woodlands in western Oregon and western and central California, eastern Arizona and adjacent New Mexico, the Big Bend area of Texas, and many areas in Mexico south to Colombia. The Acorn woodpecker is found in the western half of Oregon and California, and in Arizona, New Mexico and down throughout Mexico. Time of year: Year-round resident, non-migratory Relative Abundance: Common in proper habitat. The acorn is noisy and conspicuous in communal groups, with raucous “Woody Woodpecker” calls. Acorn woodpeckers are highly social birds. The acorn woodpecker’s habitat range will start to shift up north as temperatures rise due to climate change. EXPANSION OF THE BREEDING RANGE OF THE ACORN WOODPECKER EAST OF THE SIERRA NEVADA, CALIFORNIA ANDREW KIRK and LEAH KIRK, P.O. This range map was created by attributing sub-watershed polygons with information of a species' presence, origin, seasonal and reproductive use. Behavior: A bark-gleaner. Range of the Acorn woodpecker. The Acorn woodpecker needs a large family to collect and store enough acorns for the winter. Diet of the Acorn woodpecker. The breeding females often keep their eggs together in a shared nest, which is always inside a tree cavity. STATUS: The Acorn Woodpecker appears to be relatively stable in Texas. Multiple members help incubate the eggs. Acorn Woodpecker Nesting Habits. 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