Call: loud wack-a , wack-a or ja-cob , ja-cob series. Habitat/Range/ Migration: Acorn Woodpeckers occur in areas with mature Live Scrub Oak trees particularly in transition zones between oak plant communities and Ponderosa Pine forest. Range of the Acorn woodpecker. The acorn is noisy and conspicuous in communal groups, with raucous “Woody Woodpecker” calls. 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. They live together in groups of up to 12 or more, and they nest and raise their broods communally. The Acorn woodpecker needs a large family to collect and store enough acorns for the winter. The Acorn Woodpecker has a large range of 1,500,000 square kilometers. Time of year: Year-round resident, non-migratory Relative Abundance: Common in proper habitat. The acorn woodpecker’s habitat range will start to shift up north as temperatures rise due to climate change. The one exception is the confirmation of breeding in south-central Texas. 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. Acorn woodpeckers are highly social birds. Development: Across the acorn woodpecker's range, the complete nesting cycle takes approximately 45 days to complete (4 days for egg-laying, 11 days for incubation, and 30 to 32 days for young to develop before fledging) [68,72,135]. EXPANSION OF THE BREEDING RANGE OF THE ACORN WOODPECKER EAST OF THE SIERRA NEVADA, CALIFORNIA ANDREW KIRK and LEAH KIRK, P.O. The breeding females often keep their eggs together in a shared nest, which is always inside a tree cavity. Multiple members help incubate the eggs. Diet of the Acorn woodpecker. Acorn Woodpecker. Acorn Woodpecker Nesting Habits. Acorn hoarded by acorn woodpecker Food and homes Acorn woodpeckers, as their name implies, depend heavily on acorns for food. and where they nest. This range map was created by attributing sub-watershed polygons with information of a species' presence, origin, seasonal and reproductive use. STATUS: The Acorn Woodpecker appears to be relatively stable in Texas. 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