Woodpeckers
Melanerpes formicivorus
The Acorn Woodpecker is a highly social bird known for its striking, clown-like facial pattern and its unique habit of storing acorns. These fascinating woodpeckers live in communal groups, often consisting of multiple breeding adults and helpers. They are a conspicuous presence in oak woodlands, where their loud calls and active foraging behaviors are readily observed.
Typical adult measurements.
Individuals and populations vary.
01 / The telltale details
Start with shape and behavior. Then look for the smaller details.
Adults have a bold black, white, and red head pattern with distinctive white eyes.
Both sexes have a bright red crown. Males have the red cap meeting a white forehead, while females have a black band separating the red cap from the white forehead.
Mostly black on the back and chest, with a white belly and a white rump visible in flight.
In flight, observe three distinct white patches: one on each wing and one on the rump.
02 / A place in the world
Acorn Woodpeckers are closely associated with oak and pine-oak woodlands, savannas, and mixed forests. They are most common where several oak species grow together, ensuring a more consistent acorn supply. They can also be found in urban areas with suitable oak trees.
This species is found from southwestern Washington state, through western Oregon and California, east to parts of Arizona, New Mexico, and western Texas. Their range extends south through the mountain ranges of Mexico and Central American highlands, reaching into the northern Andes of Colombia.
Most Acorn Woodpecker populations are permanent residents, remaining in their territories year-round. However, some individuals or groups may move to other areas if local acorn crops fail, particularly in the southwestern United States, where they might migrate to Mexico for the winter.
03 / Listen a little closer
They produce a variety of loud, parrot-like squawks and calls, often described as a laughing "waka-waka-waka." These calls are used for greeting family members and in territorial disputes.
04 / The life behind the feathers
Their diet is omnivorous, consisting primarily of acorns, which can make up half or more of their annual food intake, especially in winter. They also consume insects, particularly ants, often caught in flight or gleaned from trees. Other foods include various nuts, fruits, seeds, sap, and occasionally bird eggs or lizards.
Acorn Woodpeckers are renowned for their communal food storage. They drill numerous holes in trees, utility poles, or even buildings, creating 'granaries' where they store acorns. They also catch flying insects in acrobatic sallies from perches and glean insects from tree surfaces.
These woodpeckers are cooperative breeders, with groups of up to 12 or more adults participating in nesting activities. They excavate nest cavities in dead or living branches of large trees, or in dead trees. Multiple females within a group may lay eggs in a single communal nest.
Acorn Woodpeckers live in complex social groups, often consisting of breeding adults and non-breeding offspring from previous years who act as helpers. These groups cooperatively defend their territories and granaries year-round. They are known for their active and noisy social interactions.
05 / An eye for the difference
The Red-headed Woodpecker has an entirely red head and lacks the complex black and white facial pattern of the Acorn Woodpecker.
Nuttall's Woodpecker has a barred back and lacks the solid black back and white eyes of the Acorn Woodpecker.
The Hairy Woodpecker has a ladder-backed pattern and lacks the bold facial markings and solid black back of the Acorn Woodpecker.
AI-assisted species research. Prepared September 2026. Details can vary across regions and populations.