Acorn Woodpecker

Melanerpes formicivorus



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Figure 1. Distribution of the Acorn Woodpecker in North and Middle America.

This species also occurs in northern South America. Only a few populations of this species are migratory; see text for details.

Figure 2. Annual cycle of breeding, molt, and migration of the Acorn Woodpecker in central coastal California.

Thick lines show peak activity, thin lines off-peak. Although most individuals breeding in this and other populations do so in spring, some breed in the autumn as well. See text for details.

Figure 3. Acorn Woodpeckers store acorns in drilled holes.

Acorn Woodpeckers typically store acorns in drilled holes, to be used as food at later dates. Some large trees contain 1000s of such holes. Drawing by J. Schmitt.

Figure 4. Relative abundance of Acorn Woodpecker during the breeding season.

Based on data from the North American Breeding Bird Survey, 2011–2015. See Sauer et al. (2017) for details.

Figure 5. Regional trends in Acorn Woodpecker breeding populations.

Based on data from the North American Breeding Bird Survey, 1966–2015 (Sauer et al. 2017). Data show estimates of annual population change over the range of the survey; areas of increase are shown in blue and declines are shown in red. See Sauer et al. (2017) for details.

Recommended Citation

Koenig, W. D., E. L. Walters, P. B. Stacey, M. T. Stanback, and R. L. Mumme (2019). Acorn Woodpecker (Melanerpes formicivorus), version 2.0. In The Birds of North America (P. G. Rodewald, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA.